United States Department of Transportation
i
Empirical Evaluation of the Accuracy of Technologies for Measuring Average Speed in Real Time
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2017-08-01
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[PDF-2.08 MB]
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Edition:Final Report August 2013 to June 2016
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Abstract:The determination of travel time conditions for traveler information plays an important role in setting driver trip expectation and informed route selection decisions. The Tennessee Department of Transportation (TDOT) has the ability to compute expected travel time within the four (4) urban areas where corridors have been fully instrumented with SmartWay ITS field devices and associated communication. However, TDOT currently lacks the ability to effectively provide this travel time information to travelers in corridors beyond the SmartWay program in many suburban corridors outside the urban areas. Federal regulations require all state DOT’s to develop means to measure traffic speeds and calculate travel times for all maintained road networks by 2014. This study acquired and examined probe vehicle based real-time travel data and strategize a sustainable implementation plan to provide comprehensive travel time information to motorists in the years to come. This is a continuation from a Tennessee Technical Assistance Program (TTAP) contract where a probe vehicle database from INRIX as well as ground truthing equipment from 3M had previously been acquired. A significant amount of the effort went to the analysis of the quality of the field data from sources including INRIX, ALPR, NAVTEQ, Bluetooth, Google Maps and TELVENT.
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