User Manual - Minnesota Department of Transportation

User Manual - Minnesota Department of Transportation
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ITS INNOVATIVE IDEA PROGRAM ARTERIAL TRAVEL TIME MONITORING SYSTEM USING BLUETOOTH PROJECT User Manual January 2011 19‐J09‐1911 Arterial Travel Time Monitoring System Using Bluetooth Technology DOCUMENT VERSION CONTROL Document Name Version 1.0 Version 2.0 1 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Submittal Date January 2011 March 2011 Version No. 1 2 Arterial Travel Time Monitoring System Using Bluetooth Technology TABLE OF CONTENTS Document Version Control ............................................................................. 1 Table of Contents ........................................................................................... 2 List of Figures ................................................................................................. 3 Glossary of Acronyms..................................................................................... 4 1 Introduction ............................................................................................. 5 1.1 PURPOSE ...................................................................................................................... 5 1.2 OVERVIEW OF THE ARTERIAL TRAVEL TIME MONITORING SYSTEM USING BLUETOOTH TECHNOLOGY ............................................................................................................................. 5 1.3 LOCATIONS OF BLUETOOTH RECEIVERS ............................................................................... 5 2 Arterial Travel Time Monitoring System Hardware .................................. 6 2.1 POWER SUPPLY .............................................................................................................. 8 3 Leased Communications .......................................................................... 8 4 Initial Configuration ................................................................................. 9 4.1 4.2 RSU SETUP/CONFIGURATION .......................................................................................... 9 STREETWAVE INSTALLATION/CONFIGURATION ................................................................. 10 5 Data Processing ...................................................................................... 10 5.1 USER INTERFACE .......................................................................................................... 11 5.1.1 Interface Access .................................................................................................. 11 5.1.2 StreetWave Server Main Menu/Tabs .................................................................. 12 5.1.3 Overview ............................................................................................................. 12 5.1.4 RealTime Graph ................................................................................................... 13 5.1.5 StreetWAVE Travel Time Tab Options ................................................................. 14 5.1.6 Viewing StreetWAVE Travel Time ....................................................................... 18 5.1.7 Viewing Average Speed Information .................................................................. 22 5.1.8 Location Measurements ..................................................................................... 24 5.1.9 RSU Segments ..................................................................................................... 27 5.1.10 MAC Filter ........................................................................................................... 29 5.1.11 Help Tab .............................................................................................................. 29 5.2 TECHNICAL ASSISTANCE ................................................................................................. 31 2 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology LIST OF FIGURES FIGURE 1. STREETWAVE RSU WITH 3G ANTENNA .......................................................... 7 FIGURE 2. RSU ETHERNET AND POWER CONNECTIONS ................................................ 7 FIGURE 3. PHOENIX CONTACT AC /DC POWER CONVERTER .......................................... 8 FIGURE 4. STREETWAVE SERVER LOG‐IN SCREEN ........................................................ 11 FIGURE 5. STREETWAVE OVERVIEW SCREEN ............................................................... 12 FIGURE 6. OVERVIEW SCREEN WITH RSU DETAILS ....................................................... 13 FIGURE 7. STREETWAVE REALTIME GRAPH SCREEN .................................................... 14 FIGURE 8. TRAVEL TIME/GRAPH INPUTS > START DATE SCREEN ................................. 15 FIGURE 9. TRAVEL TIME GRAPH INPUTS > START TIME SCREEN .................................. 15 FIGURE 10. TRAVEL TIME, ADVANCED FILTERS > AVERAGE INTERVAL SCREEN ............. 16 FIGURE 11. TRAVEL TIMES, ADVANCED FILTERS > MAX TIME SCREEN .......................... 16 FIGURE 12. TRAVEL TIMES, ADVANCED FILTERS > TIME TYPE SCREEN .......................... 17 FIGURE 13. AVERAGE TRAVEL TIME WITH DATA FILTER SCREEN ................................... 19 FIGURE 14. AVERAGE TRAVEL TIME WITHOUT DATA FILTER SCREEN ........................... 20 FIGURE 15: TRAVEL TIMES: TABULAR DISPLAY USING THE AVERAGE TABLE ................ 21 FIGURE 16: TRAVEL TIMES: TABULAR DISPLAY USING THE RAW TABLE ....................... 22 FIGURE 17. AVERAGE TRAVEL SPEEDS SCREEN .............................................................. 23 FIGURE 18. LOCATION MEASUREMENTS > AVERAGE TIME BT DEVICES SEEN AT ONE LOCATION ...................................................................................................................... 24 FIGURE 19. LOCATION MEASUREMENTS SHOWING DEVICES SCANNED AS WELL AS OBSERVED DURATION ...................................................................................................... 25 FIGURE 20. LOCATION MEASUREMENTS: TABULAR DISPLAY OF AVERAGE TABLE ....... 26 FIGURE 21. LOCATION MEASUREMENTS: TABULAR DISPLAY USING THE RAW TABLE . 26 FIGURE 22. RSU CONFIGURED SEGMENTS ..................................................................... 28 FIGURE 23. EDIT RSU SEGMENT SCREEN ........................................................................ 28 FIGURE 24. MAC FILTER SCREEN ..................................................................................... 29 FIGURE 25. HELP MENU SCREEN .................................................................................... 30 FIGURE 26. HELP MENU FOR TRAVEL TIMES .................................................................. 30 3 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology GLOSSARY OF ACRONYMS AC – Alternating Current BT ‐ Bluetooth dBi – Decibel Isotropic DC – Direct Current DNS – Domain Name System DSRC – Dedicated Short Range Communication Ghz ‐ Gigahertz GPS – Global Positioning System IP – Internet Protocol ITS – Intelligent Transportation Systems kbps – Kilobytes Per Second LAMP – Software including Linux, Apache, MySQL, and PHP LAN – Local Area Network MAC – Media Access Control ms ‐ Millisecond NTP – Network Time Protocol OS – Operating System PHP – Hypertext Preprocessor RF – Radio Frequency RSU – Road Side Units TCP/IP – Transmission Control Protocol/Internet Protocol 4 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology 1 INTRODUCTION 1.1 PURPOSE The purpose of this document is to provide Hennepin County Public Works and the Minnesota Department of Transportation (Mn/DOT) with the necessary knowledge and basic instructions for using StreetWAVE Bluetooth receivers with a third‐party hosted web interface in the collection of travel time data along the CSAH 81 corridor. The Arterial Travel Time Monitoring System Using Bluetooth Technology Project is a pilot deployment demonstration funded by Mn/DOT’s 2009 ITS Innovative Idea Program. This pilot deployment focused on the demonstration of the system’s hardware, communications, system software and collection of Bluetooth data along CSAH 81 (Hennepin County) to determine travel times along test segments of the corridor. 1.2 OVERVIEW OF THE ARTERIAL TRAVEL TIME MONITORING SYSTEM USING BLUETOOTH TECHNOLOGY The Arterial Travel Time Monitoring System Using Bluetooth Technology is an “infrastructure‐based probe” system that utilizes Bluetooth technology to track the progress of vehicles in real‐time along an arterial corridor. The unique identifier (i.e., “signature”) for each vehicle is the MAC address for a Bluetooth device located within the vehicle (e.g., hands free communications for cell phones, a laptop or other Bluetooth‐enabled device). The MAC addresses are read and time‐stamped by Bluetooth receivers as the vehicles travel along the CSAH 81 corridor. This information is automatically transmitted to a central server (StreetWAVE) where a software algorithm matches the vehicle signatures and time stamps collected at six different locations along CSAH 81. Segment travel times for each vehicle identified by the system are calculated. Then the individual segment travel times of multiple vehicles are combined to calculate the average travel time and average speed for each segment. 1.3 LOCATIONS OF BLUETOOTH RECEIVERS The deployment of wireless Bluetooth receivers (also known as Road Side Unit or RSU) for the Arterial Travel Time Monitoring System Using Bluetooth Technology project is limited geographically to six (6) intersections along CSAH 81 between Brooklyn Park on the north end and Robbinsdale on the south end as shown in Table 1: 5 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology TABLE 1 ‐‐ LOCATIONS OF BLUETOOTH RECEIVERS ON CSAH 81 Intersection Mounting Location Captured Traffic NE and SW corners (2) NB and SB CSAH 81 /71st Avenue SW Corner NB and SB CSAH 81 / 63rd Avenue NE corner NB and SB CSAH 81 / Bass Lake Rd CSAH 81/Greenhaven Dr. SW corner NB and SB nd
NE corner NB and SB th
NW and SE corners (2) NB and SB CSAH 81 / 42 Avenue CSAH 81 / 36 Avenue 2 ARTERIAL TRAVEL TIME MONITORING SYSTEM HARDWARE The Arterial Travel Time Monitoring System installed along CSAH 81 consists of the following hardware:  Eight (8) Savari Networks “StreetWAVE” Bluetooth Receivers  Eight (8) 2.4 GHz 6 dBi Omni‐Directional Wireless LAN Bluetooth Antennas  Eight (8) Wireless 5 Ghz Dual Band Omni Antennas  Six (6) 3G Antennas with Brackets for Pole Mounting  Eight (8) Phoenix Contact Power Converter Units  Eight (8) Cabinets to House Power Converter Units  Power and Ethernet Cables for each StreetWAVE Device  Band‐It Strapping for Pole Mounting A picture of each of the hardware components installed for the Arterial Travel Time Monitoring System is shown in Figures 1, 2, and 3. 6 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology FIGURE 1. STREETWAVE RSU WITH 3G ANTENNA
FIGURE 2. RSU ETHERNET AND POWER CONNECTIONS 7 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology FIGURE 3. PHOENIX CONTACT AC /DC POWER CONVERTER 2.1 POWER SUPPLY The StreetWAVE Bluetooth device uses 24 volt (V) DC power. Each traffic signal pole has been supplied with a field hardened 120 V AC to 24 V DC Phoenix Contact power converter unit to allow the traffic signal power supply to step down to the low voltage Bluetooth device. 3 LEASED COMMUNICATIONS A wide array of communication alternatives can be used for transmitting the MAC addresses, time stamps, and location information to a central location for subsequent processing. Due to the lack of an existing county‐owned communications network, a 3G wireless provider was installed at each intersection. This solution provided a reliable communications network while minimizing costs and impact to the implementation schedule. Sprint has provided the wireless service at each of the six project intersections since May 2010 with the installation of a 3G modem. Each intersection 8 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology communicates independently with the central server. This approach was chosen to ensure that no single point of communications failure will occur during system operations. Wireless service from Sprint’s 3G network was tested during field surveys, which were conducted prior to the system’s installation in May 2010. Those surveys indicated the following results:  At all device locations, 3G download speeds ranged from 500kbps to 1.5Mbps. Upload speeds ranged from 200kbps to 550kbps. This was more than enough to satisfy the project data communication requirements.  Network latency at all sites was measured between 57ms and 117ms. This reading was more than enough to satisfy project requirements. Wi‐Fi interference was also measured at each of the project intersections. Based on the field survey performed, it was determined that interference would not significantly affect the communications performance in the field at any location. At Greenhaven Drive and CSAH 81, there are two RSUs in the same intersection. One of these RSUs connects to the StreetWAVE server using a 3G interface (SWGreenhavenN). The 2nd RSU (SWGreenhavenS) uses a Wi‐Fi connection to connect to the server through the SWGreenhavenN RSU. This configuration is also used for the two RSUs in the 36th Avenue intersection. 4 INITIAL CONFIGURATION The StreetWAVE Road Side Unit (RSU) and the StreetWAVE server require minimum network configuration. The RSU sends collected BT device data to the server via TCP/IP. It relies on Internet access to obtain DNS and NTP information. If the RSU is deployed on a private network, then it is necessary to configure access to the Internet through any firewall. 4.1 RSU SETUP/CONFIGURATION The RSU is configured to dynamically obtain its IP networking configuration:  IP Address  Network Mask  Default Gateway The StreetWAVE server address is statically configured. Optionally, the DNS server and the Network Time Protocol (NTP) server address can be statically configured. 9 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology 4.2 STREETWAVE INSTALLATION/CONFIGURATION The StreetWAVE server uses the LAMP software bundle consisting of Linux, Apache, MySQL and PHP. Linux is the OS of the server; Apache is used as the web server, MySQL for the database and PHP as the scripting engine. The server can be accessed over the network using any standard supported web browser. The minimum screen resolution on the client side is 1280 x 800. Once the RSUs and the StreetWAVE are configured and the communications link enabled, the StreetWAVE server auto‐discovers the RSUs along with their locations and operational status (details in the StreetWAVE Overview tab section). Once the RSUs are discovered, it is expected that the user provisions RSU segments from the RSU segments tab. All travel time related information can now be viewed for specific RSU segments. The StreetWAVE server is designed to be intuitive and self‐explanatory. The following design aspects are common to all the various features and menu options available:  A help window is displayed when the mouse pointer is placed across any text in bright blue.  A color palette is available next to all data types such that the individual color of the plotted line/dots can be changed.  The plotted graph type can be chosen to be either “line” or “dots”.  Certain graph data can be downloaded either in ‘csv’ or ’xml’ format.  ‘Reset’ button loads all default values for that page. 5 DATA PROCESSING Each StreetWAVE RSU continuously scans for the presence of any BT device within its radio transmission range. As BT devices enter and leave the radio transmission range of the RSU, the RSU typically detects and records their presence multiple times. These records consist of the MAC address of the BT device, the time stamp and the ID of the RSU. It is necessary to separate records of the BT devices detected multiple times from records of BT devices that leave and return. The objective is to distinguish between vehicles that linger in the vicinity of the RSU from vehicles that leave and return. This is done by aggregating all records for a particular BT device with time stamp difference of less than 60 seconds. In other words, if a BT device record is within 60 seconds of the previous record, then these records are considered an indication of multiple detections of the same vehicle within the vicinity of the RSU, but not a vehicle that leaves and returns. A gap in BT device records of more than 60 seconds is considered to be an indication that the vehicle left the vicinity of the RSU. 10 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology The basis for further travel time processing is the aggregate block of all BT device records separated by less than 60 seconds. This block has an identifiable start time (first time the BT device was detected) and end time (last time the BT device was detected). 5.1 USER INTERFACE 5.1.1 INTERFACE ACCESS The StreetWAVE Bluetooth reader system is available via the web‐based interface at http://minneapolis.savarinetworks.com. It provides access to project data collected along CSAH 81 in Hennepin County. The user is required to log‐in with a username and password as seen in Figure 4. The current username and password is “savari” for both fields. FIGURE 4. STREETWAVE SERVER LOG‐IN SCREEN 11 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology 5.1.2 STREETWAVE SERVER MAIN MENU/TABS After log‐in, the default page displayed is the first tab of the StreetWAVE server, which is called “Overview”. In addition to the “Overview” tab, there are six other tabs.  Real Time Graph  Travel Times  Location Measurements  Road Segments  MAC Filter  Help In addition, there is an “Auto Update Graph Off” and “Logout”. The former button can be toggled to “on” or “off” to enable auto graph updates triggered on any input parameter change. By default, this feature is turned off. 5.1.3 OVERVIEW FIGURE 5. STREETWAVE OVERVIEW SCREEN The StreetWAVE default page (Overview tab) provides an overview of the CSAH 81/Hennepin County system, as shown in Figure 5. The Overview tab shows the location of each StreetWAVE reader on a system map, its current operational status, and other basic operational information. The server also allows users to monitor the system and to generate reports from data gathered through the system’s readers installed in the field. 12 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology Clicking on a particular RSU icon will bring up detailed information, including location (latitude, longitude, IP address, etc). FIGURE 6. OVERVIEW SCREEN WITH RSU DETAILS Each of the Overview icons displayed at the six intersections along the CSAH 81 corridor has the ability to demonstrate the real‐time operational status of the StreetWAVE units. Icons are displayed in one of three colors—green, red or yellow—depending upon the current state of operation of the StreetWAVE unit at a particular location:  Green indicates that the StreetWAVE device is online and functioning normally.  Red indicates that the StreetWAVE device is offline and there is no communication with the StreetWAVE server  Yellow indicates that StreetWAVE device is in an alarm state with limited communication to the StreetWAVE server. 5.1.4 REALTIME GRAPH The tab labeled “RealTime Graph” displays real‐time travel time for a particular RSU segment. The window displays all current travel time information averaged every 15 seconds. The chart is updated/refreshed every 15 seconds. This means that all travel time data from matched Bluetooth devices within a 15 second interval are shown as one average value. Currently, the maximum travel time displayed needs to be within one hour (60 minutes). The window shows the travel time for the last 60 minutes with the absolute time referenced on the x‐axis as the time corresponding to the destination RSU. 13 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology FIGURE 7. STREETWAVE REALTIME GRAPH SCREEN Figure 7 graphically displays the travel times and matched BT devices. The light green horizontal line represented on the graph is the “Threshold Travel Time”, as described in Section 5.1.9, “RSU Segments”. 5.1.5 STREETWAVE TRAVEL TIME TAB OPTIONS The basic concept of calculating travel time follows a simple logic of finding a BT device that has been seen at both the Source RSU and the Destination RSU. The travel times are then calculated by taking the difference in time that the device was seen at each RSU. The plot is then shown on a simple chart with the Y‐axis corresponding to travel time and the X‐axis corresponding to the times at the source RSU. The travel times can be averaged over various time‐intervals that are user selectable within the “Advanced Filters” box within the “Travel Times” tab. The various parameters of a travel time query are:  Start date/time at source RSU and end date/time at destination RSU  Maximum expected travel time (default to 1 hour)  “Time Type” – default to “Last – First” (Last scan at source RSU and First scan at destination RSU). 14 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology FIGURE 8. TRAVEL TIME/GRAPH INPUTS > START DATE SCREEN Start date and start time drop down options are shown in Figure 9. The former shows the current month whereas the latter displays options from midnight (12:00 AM to 11:45 PM). FIGURE 9. TRAVEL TIME GRAPH INPUTS > START TIME SCREEN 15 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology FIGURE 10. TRAVEL TIME, ADVANCED FILTERS > AVERAGE INTERVAL SCREEN The Average Interval, as shown in Figure 10, is the interval of time within which chart data is averaged and displayed. A value of 15 minutes (default) indicates that data represented against the y‐axis (travel time, speed and device counts) is averaged over the 15 minute interval and represented on the x‐axis against the absolute time (corresponding to the start time of the interval, e.g., 12.00 PM, 12.15 PM, etc). FIGURE 11. TRAVEL TIMES, ADVANCED FILTERS > MAX TIME SCREEN The option “Max Time” (default 60 minutes) shown in Figure 11 corresponds to a boundary condition wherein the user can select the maximum travel time to be 16 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology displayed within the graph. Matched MAC addresses that have a travel time beyond this chosen value will be filtered and not shown in the graph. FIGURE 12. TRAVEL TIMES, ADVANCED FILTERS > TIME TYPE SCREEN The “Time Type” represents the scan interval to be considered for calculation of travel time between two RSUs. Figure 12 shows an example of the different “Time Types”. The scan interval can be either based on the “first‐seen” or “last‐seen” time stamp of the BT device. Depending on the location of the RSU and other conditions such as congestion, etc., a particular BT device may be seen at an RSU for a longer time. In a free traffic flow scenario, it is conceivable that a BT device may only be seen once. Travel time based on the source RSU first‐seen to destination RSU last‐seen yield the highest averages whereas source RSU last‐seen to destination RSU first‐seen yield the lowest averages. The default is a condition of “last seen to first seen”. The “Data Filter” controls the quality of the graph by including or excluding outliers. If “None” is selected, this means that the graph will display raw data. The “95% Confidence Interval” is a filter applied when a graph is wanted without outliers. The filter is a confidence filter which works on elimination of the last 5% of the travel times within a distribution of the frequency of occurrence of a particular travel time. “Graph Controls” control the specific graph to view. The user can choose any or a combination of the following:  Time Avg – Draws a graph showing average travel times  Time Min – Draws a graph showing minimum travel times within the chosen time interval 17 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology 
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Time Max – Draws a graph showing maximum travel times within the chosen time interval Raw Times – Draws a graph showing the raw (actual) points/data of the travel times Devices Scanned – Shows a count of the number of matched BT devices Travel Speeds – Shows a graph of the average speeds within the chosen interval. 5.1.6 VIEWING STREETWAVE TRAVEL TIME Once a query is entered with the above‐mentioned criteria, the server collates all matched BT device travel times. The collated data is grouped within the “Average Interval” specified in the “Advanced Filters” box and is defaulted to 15 minutes. Note that in all graphs the user can zoom into a portion of the graph by selecting it. Double‐clicking on the graph will restore the original graph view. Figure 13 and Figure 14, respectively, show average travel time graphs with and without the data filter. As expected, the graph without the data filter shows longer travel times which are discarded as outliers with the data filter. 18 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology FIGURE 13. AVERAGE TRAVEL TIME WITH DATA FILTER SCREEN 19 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual Arterial Travel Time Monitoring System Using Bluetooth Technology FIGURE 14. AVERAGE TRAVEL TIME WITHOUT DATA FILTER SCREEN 20 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual Arterial Travel Time Monitoring System Using Bluetooth Technology A tabular display is also available to users. In the bottom right corner of the page there is an arrow pointing to the bottom of the page. A table is displayed when the arrow is clicked. The user is able to select from two types of tables (Average’ or ‘Raw’), which can be seen in Figure 15. The ‘Average’ table displays the following information:  Interval Time – The period of time the user wishes to view results. The interval time can be changed in the Advanced Filters section (see Figure 10).  Average Time – The average travel time of all captured vehicles during the given interval time.  Median Travel Time – The median travel time over the given interval time. Matched Pairs – The number of Bluetooth MAC addresses found at both the source RSU and the destination RSU.  BT Scans at Source – The number of Bluetooth MAC addresses found at the source RSU.  Percentage – The percentage of Matched Pairs to BT Scans at Source RSU. FIGURE 15: TRAVEL TIMES: TABULAR DISPLAY USING THE AVERAGE TABLE The ‘Raw’ table can be seen in Figure 16. The ‘Raw’ table provides the following information:  BTMAC – The MAC address that has been detected between these locations.  First Seen – The date and time that the MAC address was seen at the source RSU location  Last Seen ‐ The date and time that the MAC address was seen at the destination RSU location  Seen Time – The amount of time from when the MAC address was First Seen to the time it was Last Seen.  Device Type – The type of device from which the MAC address was pulled. 21 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology FIGURE 16: TRAVEL TIMES: TABULAR DISPLAY USING THE RAW TABLE 5.1.7 VIEWING AVERAGE SPEED INFORMATION The StreetWAVE server can also be used to display average travel speeds on a particular Road Segment (RSU). Figure 17 shows a graph where the average speeds for a segment are displayed. The speeds are calculated based on the travel times that have been computed previously. The road segment lengths are taken from the RSU Segments tabs. 22 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology FIGURE 17. AVERAGE TRAVEL SPEEDS SCREEN 23 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual Arterial Travel Time Monitoring System Using Bluetooth Technology 5.1.8 LOCATION MEASUREMENTS This tab can be used to retrieve graphical data pertinent to the interval of time that BT devices have been seen at a particular RSU. This data is affected by the scan range of the RSU as well as the transmitting power of the BT device. Other factors such as congestion near the RSU can affect the interval of time that BT devices are seen in that vicinity. FIGURE 18. LOCATION MEASUREMENTS > AVERAGE TIME BT DEVICES SEEN AT ONE LOCATION The average interval within the “Advanced Filters” corresponds to the interval over which the observed durations of BT devices are averaged. The “Max Observed Duration” is a filter that sets the upper limit. Figure 19 shows the Location Measurement graph, displaying both the observed duration of the BT devices at an RSU along with the count of the number of devices scanned. 24 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology FIGURE 19. LOCATION MEASUREMENTS SHOWING DEVICES SCANNED AS WELL AS OBSERVED DURATION A tabular display is also available to users. In the bottom right corner of the page, there is an arrow pointing to the bottom of the page. A table is displayed when the arrow is clicked. The user is able to select from two types of tables (‘Average’ or ‘Raw’), which can be seen in Figure 20. The ‘Average’ table displays the following information:  Interval Time – The period of time the user wishes to view results. The interval time can be changed in the Advanced Filters section (see Figure 10).  Average Observed Duration – The average time that a MAC address was seen at one location during the given interval time.  Median Observed Duration ‐ The median time that a MAC address was seen at one location during the given interval time.  Device Count – The amount of MAC addresses detected at a given location. 25 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology FIGURE 20. LOCATION MEASUREMENTS: TABULAR DISPLAY OF AVERAGE TABLE The ‘Raw’ table can be seen in Figure 21. The ‘Raw’ table provides the following information:  BTMAC – The MAC address that has been detected at this location.  First Seen – The date and time that the MAC address was first seen at this location.  Last Seen ‐ The date and time that the MAC address was last seen at this location.  Seen Time – The amount of time from when the MAC address was First Seen to the time it was Last Seen.  Device Type – The type of device that the MAC address was pulled from. FIGURE 21. LOCATION MEASUREMENTS: TABULAR DISPLAY USING THE RAW TABLE 26 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology 5.1.9 RSU SEGMENTS RSU Segments are defined as road segments that contain a unique start RSU and an end RSU. The traffic directionality is also determined by traffic flow in that order. Furthermore, other information such as length of the segment (distance), speed limits and wait times can be configured. The speed limit and wait time information may be used in the future to predict and inform motorists of potential traffic congestion ahead. Figure 22 shows the list of configured segments. The four columns shown in Figure 22 are defined below:  Distance – The distance (miles) between the source and destination RSUs.  Wait Time – The maximum delay (seconds) between the source and destination RSUs.  Speed Limit – The speed limit (miles per hour) between the source and destination RSU’s.  Threshold – This column is not currently used in the calculation of the travel times. It has been set up for future use in monitoring congestion. 27 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology FIGURE 22. RSU CONFIGURED SEGMENTS RSU Segments can be added using the ‘+’ button and deleted using the ‘trash’ icon.
Editing/configuration of an RSU segment is shown in Figure 23 below. When creating a new RSU segment, it is important to complete the fields labeled ‘Distance’ and ‘Speed Limit’. Both of these fields determine the ‘Ideal Travel Time’ which is used in the filtering process.
FIGURE 23. EDIT RSU SEGMENT SCREEN 28 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology 5.1.10 MAC FILTER The MAC Filter tab (Figure 24) can be used to filter all graphical data (location measurements, travel times and real time) for a specific BT MAC address. Savari envisions this feature to be used only for specific controlled test data. The MAC address needs to be entered in the universal MAC address format of 6 octets each of which is separated by a colon, e.g., AA:BB:CC:DD:EE:FF. Any number of MAC addresses can be entered, but only one per line. MAC address entries can also be deleted and the resulting entries saved using the ‘save’ button. FIGURE 24. MAC FILTER SCREEN
5.1.11 HELP TAB The “Help” tab provides information for each tab along with a summary of each configurable parameter. The Help tab is not intended to provide a very detailed explanation but rather a brief overview of each parameter. 29 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology FIGURE 25. HELP MENU SCREEN Upon choosing the ‘Help’ tab, the various tab/menus are shown on the left side of the screen. Selecting any of these menus will pull up the help/definitions for all parameters on that page. FIGURE 26. HELP MENU FOR TRAVEL TIME 30 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology 5.2 TECHNICAL ASSISTANCE During the project demonstration period, Iteris and Hennepin County Public Works jointly shared the technical assistance and troubleshooting duties for the StreetWAVE system along CSAH 81. Iteris staff was responsible for field troubleshooting in coordination with Savari Networks staff. Hennepin County Public Works personnel assisted Iteris and Savari Networks in the areas of StreetWAVE unit installation, troubleshooting (requiring the use of bucket trucks and other tools) and overall continual field maintenance duties. For more information on the Savari StreetWAVE device technical requirements, users can go to the company’s website at www.savarinetworks.com or contact Savari Networks by phone, fax or email. Please see contact information below. Savari Networks LLC
2005 De La Cruz Boulevard, Suite 128 Santa Clara, CA 95050 +1 408 833 6369 (Main) +1 408 583 4061 (Fax) [email protected] 31 Mn/DOT ITS Innovative Idea Program
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual
Arterial Travel Time Monitoring System Using Bluetooth Technology APPENDIX A SAVARI STREETWAVE INSTALLATION GUIDE Mn/DOT ITS Innovative Idea Project
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual Arterial Travel Time Monitoring System Using Bluetooth Technology Submitted by: ITS INNOVATIVE IDEA PROGRAM ARTERIAL TRAVEL TIME MONITORING SYSTEM USING BLUETOOTH TECHNOLOGY StreetWAVE Installation Guide Submitted to: Mn/DOT January 2011 19‐J09‐1911 Mn/DOT ITS Innovative Idea Project
Arterial Travel Time Monitoring System Using Bluetooth Technology User Manual Arterial Travel Time Monitoring System Using Bluetooth Technology Version 1
TABLE OF CONTENTS ANTENNA INSTALLATION AND SEALING ............................................................... 1 MOUNTING TO THE POLE ................................................................................... 3 CONNECTING POWER AND ETHERNET CABLES ...................................................... 4 SECURING CABLES ............................................................................................. 6 SERIAL PORT ................................................................................................... 6 REMOVAL AND STORAGE ................................................................................... 6 ANTENNA SPECIFICATIONS ................................................................................. 8 TABLE OF FIGURES FIGURE 27: STREETWAVE AND 3G ANTENNA INSTALLATION ......................................................... 1 FIGURE 28: SEALED ANTENNA AND ETHERNET CONNECTORS ....................................................... 2 FIGURE 29: 3G MOUNTING BRACKET ASSEMBLY ............................................................................ 3 FIGURE 30: ETHERNET SEALING ASSEMBLY .................................................................................... 4 FIGURE 31: POWER CONNECTOR BEFORE TWISTING ..................................................................... 4 FIGURE 32: GROUND WIRE PLACEMENT: 3G MOUNTING BRACKET (LEFT) AND STREETWAVE UNIT (RIGHT) ................................................................................................................................... 6 Page i Mn/DOT ITS Innovative Idea Program‐StreetWAVE Installation Guide Arterial Travel Time Monitoring System Using Bluetooth Technology Version 1
3G
Antenna
Wifi 2.4 GHz
Antenna
Bluetooth
2.4 GHz
Antenna
FIGURE 22: STREETWAVE AND 3G ANTENNA INSTALLATION
DSRC (5 GHz)
Antenna
ANTENNA INSTALLATION AND SEALING 1. The StreetWAVE unit uses four antennas connected to the unit to collect and
disseminate information. The antennas used can be seen in Table 1. The
Bluetooth (2.4 GHz), Wifi (2.4 GHz) and DSRC should be connected directly
to the StreetWAVE unit. The location where each antenna should be
connected to the unit is labeled. The label included on the device is shown in
Table 1. The final product configuration when mounted to the pole can be
seen in Figure 27. Hand tighten the antenna connectors to the device, being
careful not to over tighten. Do not over tighten. The GPS antenna is factory
installed. For more information on the specifications of the antennas used,
refer to Appendix A.
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FREQUENCY/FUNCTION
Bluetooth. 2.4GHz
WiFi. 2.4GHz
DSRC
Cellular (Install on bracket)
LABELS
BT
WiFi
5GHz
3G
Table 1: Antenna Bands and Labels
2. Connect the RF Cable to the StreetWAVE at the 3G location. The RF Cable
will be connected to the 3G antenna during installation.
3. Secure each antenna connector by wrapping self-sealing electrical tape
(provided) around each antenna connectors and RF cable connectors to
prevent water from entering the connectors. The wrapping should cover the
entire StreetWAVE connector, antenna connector and at least two inches of
the antenna cable. Figure 28 shows an example of how the connectors
should be secured by the electrical tape.
FIGURE 23: SEALED ANTENNA AND ETHERNET CONNECTORS
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MOUNTING TO THE POLE 1. Install the mounting bracket to the back of the StreetWAVE unit. Use four (4)
self-tapping screws (provided) and orient the bracket so the antennas are
vertical, with the Wifi 2.4 GHz and RF Cable at the top of the device.
2. Secure the StreetWAVE unit to the pole using the Band-It mounting system.
For more information on the Band-IT mounting system, refer to the following
website: http://www.band-it-idex.com/en/index.html. The mounting bracket
will accommodate a Band-It width of 1.2 inches.
3. Install the 3G antenna bracket two (2) feet away from the StreetWAVE unit.
The U-bolt (provided) and bracket can accommodate poles up to 1¾ inches in
diameter. After the bracket has been secured, place the 3G antenna on the
mounting bracket and connect the RF cable to the 3G antenna connector.
Hand tighten the 3G antenna connector to the RF cable, being careful not to
over tighten. Figure 29 shows the 3G mounting bracket with U bolt, locking
bracket, nuts, flat washers and lock washers (provided with the antenna
bracket). When installing the bracket, secure the ground wire lug under one
of the bracket nuts.
FIGURE 24: 3G MOUNTING BRACKET ASSEMBLY
.
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CONNECTING POWER AND ETHERNET CABLES 1. Push the RJ-45 Ethernet connector through the sealing assembly provided
with the StreetWAVE unit. Tighten the sealing nut until the rubber gland inside
the nut is tightly compressed around the Ethernet cable. Figure 30.
Ethernet
Receptacle
Washer
Ethernet
Sealing
Assembly
FIGURE 30: ETHERNET
SEALING ASSEMBLY
Power
Receptacle
Twist Ring
Power Cable
Connector
FIGURE 31: POWER
CONNECTOR BEFORE
TWISTING
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2. Insert the RJ-45 into the Ethernet receptacle and press firmly to ensure it is
connected.
3. Screw the RJ-45 sealing assembly into the receptacle. Ensure the rubber washer
between the sealing assembly and receptacle remains flat and does not kink.
4. Connect the power cable to the StreetWAVE by aligning the white dots on the cable
connector with the white dot on the receptacle. Figure 31 shows how the connector
cable is to be aligned with the power receptacle. Once the dots have been aligned,
insert the cable connector into the receptacle and turn the twist ring (center dot)
clockwise until it clicks.
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SECURING CABLES 1. Connect the free end of the ground wire to the StreetWAVE unit using the screw
between the power and Ethernet connectors as shown in Figure 32.
Ground Wire
Ground Wire
FIGURE 32: GROUND WIRE PLACEMENT: 3G
MOUNTING BRACKET (LEFT) AND STREETWAVE UNIT
(RIGHT)
2. Position the power and Ethernet cables so they are not near the antennas. Secure
the cables behind the StreetWAVE unit using wire ties or electrical tape. Only use
wire ties that are weather resistant and rated for outdoor use.
3. Use wire ties to secure the 3G antenna cable, power cable and Ethernet cable to the
mounting surface as shown in Figure 27.
SERIAL PORT 1. The serial port on the side of the StreetWAVE is for diagnostic use only. It should
remain covered by the factory installed cap.
REMOVAL AND STORAGE 1. To remove the power connector, twist the twist lock ring (shown in Figure 31)
counter-clockwise until the three (3) white dots are aligned. Pull the power cable
straight out from the power receptacle.
2. Unscrew the Ethernet sealing assembly. Using a small, standard screwdriver,
depress the RJ-45 locking tab inside the Ethernet receptacle and gently pull the
cable to disconnect the cable.
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3. Remove the self-sealing tape from the 3G RF extension cable by slitting the tape
and peeling it away from the connectors and cables. Disconnect the 3G antenna
cable from the extension cable.
4. Unbolt the 3G antenna bracket to remove it from the pole.
5. Carefully remove the StreetWAVE unit from its mounting position by cutting the
Band-It straps. While cutting the Band-It straps, it is important that the StreetWAVE
is being held by the person cutting the straps to prevent the unit from being dropped.
6. Once the StreetWAVE unit has been removed from its mounting position, remove
the self-sealing tape by slitting the tape and peeling it away from the connectors and
cables. Unscrew each of the antennas and place them and the StreetWAVE unit in
a box for storage.
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ANTENNA SPECIFICATIONS Page 8 Mn/DOT ITS Innovative Idea Project – StreetWAVE Installation Guide Arterial Travel Time Monitoring System Using Bluetooth Technology Version 1
Page 9 Mn/DOT ITS Innovative Idea Project – StreetWAVE Installation Guide 
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