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Title: Optimal Placement of Point Detectors on Virginia’s Freeways - Case Studies of Hampton Roads and Richmond
Project No.: 82560
Target Date: 01/31/2008

The Virginia Department of Transportation (VDOT) has deployed an extensive network of point detectors (primarily inductive loops) for real-time data collection on freeways in both Northern Virginia and Hampton Roads.  Deployment of devices on freeways in Richmond, Staunton, and Salem, other regions in which Smart Traffic Centers are located, has been much less extensive to date. 

There is a tradeoff between sensor spacing and data accuracy.  VDOT is therefore seeking a methodology to indicate the optimal locations for detector deployment such that the travel time estimate error is minimized, within the constraints of available capital and maintenance funding.

The purpose of this project is to develop a decision support tool to identify the optimal locations of a finite set of point detectors on a freeway corridor in order to minimize the error in travel time estimation.  Case studies of freeway sections in two regions, 1) Hampton Roads, and 2) Richmond, will be conducted.

     J. Guo
     Catherine C. McGhee
     B. Smith