Minnesota Department of Transportation Research Services Section
The objectives of this project were to (a) produce historic estimates of travel times on Twin-Cities arterials
for 1995 and 2005, and (b) develop an initial architecture and database that could, in the future, produce timely
estimates of arterial traffic volumes and travel times. Our Phase I field study indicated that on arterial links where
both the demand traffic volume and the signal timing are known, model-based estimates of travel time that are on
average within 10% of measured values can be obtained. Phase II of this project then focused on applying this
approach to the entire Twin Cities arterial system. The Phase II effort divided into three main subtasks: (1)
updating estimates of demand traffic volume obtained from a transportation planning model to make them
consistent with available volume measurements, (2) collecting information on traffic signal locations in the Twin
Cities and compiling this into a geographic database, and (3) combining the updated traffic volumes and signal
information to produce link-by-link peak-period travel time estimates. The traffic volume update took as inputs the
predicted volumes generated by a traffic assignment model and measured average annual daily traffic from
automatic traffic recorders, and gave as output updated estimates of the traffic volumes for links lacking automatic
traffic recorders. A request to state, county and municipal agencies in the seven-county metro area produced
Information on approximately 2,900 traffic signals. Estimated arterial travel times for the morning and afternoon
peak periods for 1995 and 2005 were then computed and sent to other components of the Access to Destinations
Davis, Gary A.; Hourdos, John; Xiong, Hui; Morris, Ted.
Access to Destinations: Arterial Data Acquisition and Network- Wide Travel Time Estimation (Phase II).
Minnesota Department of Transportation Research Services Section.
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