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- W602385428 abstract "The deployment of Advanced Traveler Information Systems (ATIS) created a need for adequate real-time dynamic data to support such systems. The deployment of larger numbers of vehicle probes, which automatically transmit when drivers start their trip (O-D) and traverse the various links (link travel times), is expected to provide a considerable amount of these real-time data. Unfortunately, few studies have analyzed actual probe data in order to evaluate their true accuracy and reliability. This paper presents some limited field tests that evaluated vehicle probe link travel time and instantaneous speed estimates, and compares them directly to Freeway Traffic Management System (FTMS) loop detector data. The study concluded that the vehicle probe link travel time estimates were consistent with the travel times measured by a human observer (error within 6 seconds). It was also found that freeway loop detector travel time estimates and vehicle probe travel times were highly correlated (correlation coefficient of 83%). Finally, the vehicle probe speed estimates were compared to odometer speed measurements for a variety of network and driver characteristic configurations. The vehicle probe speed estimates were found to be consistently within 10 km/hr of the actual speed measurements." @default.
- W602385428 created "2016-06-24" @default.
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- W602385428 date "1995-01-01" @default.
- W602385428 modified "2023-09-26" @default.
- W602385428 title "ACCURACY OF VEHICLE PROBE ESTIMATES OF LINK TRAVEL TIME AND INSTANTANEOUS SPEED" @default.
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