Along CSAH 81 Minnesota Guidestar Meeting June 20, 2012 Innovation - - PowerPoint PPT Presentation

Innovation for better mobility

Innovative Arterial Bluetooth Project Along CSAH 81

Minnesota Guidestar Meeting

June 20, 2012

Innovation for better mobility

Project Background

• Minnesota Department of Transportation (MnDOT) issued RFP for

the 2009/2010 ITS Innovative Idea Program asking for projects that demonstrate ongoing advances in technology

• Iteris was selected for project that measures travel times on an

arterial corridor in Hennepin County, MN using Bluetooth technology

• Project started in July 2009 and ended in January 2011

Can Bluetooth Readers provider accurate arterial travel time Information?

Innovation for better mobility

Why are we monitoring arterial Travel Times?

• Measuring arterial travel times is beneficial for improving:

– Signal timings – Arterial planning & planned improvements – Traveler information

• Travel time is the foremost indicator of the quality of traffic

flow currently in use

• Travel time is intuitive and easy to understand

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Project Location

• Six signalized intersections
• n CSAH 81 corridor in

Hennepin County, MN

• ADT 10,000 – 25,000

vehicles

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Technology Deployment

• Spacing along arterial: 1.7 to 3 miles

between locations

• 6 Locations, 8 Readers
• Each intersection location:

– Bluetooth Reader – GPS receiver – 3G modem for backhaul

• At corridor end locations:

– One side communicates to other side via 5 Ghz Wifi network

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Preliminary Field Tests

• Conducted field survey

– Capture rate of BT signals – Availability of 3G signal (Sprint)

• All locations: download 500kbps – 1.5Mbps, upload 200 Kbps – 550 kbps

– WiFi interference level

• Detected WiFi signals with 25%-39% signal strength

– Documented “floating car” travel times for future comparison – Connection to the web portal

36th side 36th median 42nd Bass Lake 63rd Omni 6.7% 11.4% 7.7% 3% 5.4%

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Intersection Layout

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StreetWAVE

► Integrated with 3G, WiFi, DSRC, GPS,

Bluetooth in a single platform

► 24v dc (standard) ► Single radio will support diverse

applications simultaneously ►One-way, 2-way, individual and broadcast communications

► Ruggedized NEMA enclosures to fit all

weather needs

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StreetVIEW Portal

• Provides a map with device locations and their operational

status

• Raw data is stored unfiltered in relational database
• Statistics Display

– Number of BT reads at a location in specific interval – Table display of travel times for user-definable links – Scatter plot of travel times

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Web Portal

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Dynamic Information

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Travel Times

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Set-up & Filtering

• Initial configuration easy for the agency to deploy system.

No need to do travel time runs to deploy along a corridor.

– Use Posted Speed Limit

• Filtering algorithm needs to be smart enough to allow

average speed to approach 0 mph.

– Look at previous (1 min.) interval average speed if it is declining then drop the lower limit of the filtering.

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Addresses Matched to Travel Time Runs

• Tracked the unique MAC address through the database to

Bluetooth enabled laptop running PC Travel for travel time runs completed.

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Trend Analysis

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Travel Time Runs bound Bluetooth Data

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Conclusions/Lessons Learned

• With calibration and verification, Bluetooth readers

can provide accurate travel time information for corridors with ADT greater than 15,000 ADT.

• Don’t need two readers at the end of the corridor.

Antenna coverage is not an issue.

• Place Bluetooth readers 400’ feet from

intersections or place at low volume side street intersections.

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Future Applications

• Origin/Destination Studies
• Prioritization of Corridors for Traffic Signal Retiming
• 511 Travel Time Information/Traveler Information

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Questions & Answers

For Additional Information: Steve Garbe, PE

spg2@iteris.com 402.476.5101

Lisa Raduenz

ljr@iteris.com 612.371.9200