Improve Current Design of Video Imaging Detection Systems Used for Dilemma Zone Protection
Author(s):
D.R. Middleton, E. Park, R.R. Longmire, H.A. Charara
Publication Date:
2008
Abstract:
TTI conducted a literature search and contacted agencies to determine the state-of-the-practice with respect to using video imaging vehicle detection systems (VIVDS) for dilemma zone protection. Researchers then developed an experimental design to conduct field studies for speeds from 50 mph to 70 mph at live intersections where camera mounting locations could replicate TxDOT practice. As the study began, TxDOT was installing VIVDS cameras on high-speed approaches at one of three locations:
1) on the signal head mast arm on the far side of the intersection supported by a 5-ft riser,
2) on a signal or luminaire pole within the intersection often near the stop line, or
3) two cameras per approach with one camera mounted within the intersection (i.e., #1 or #2) and the other usually mounted upstream on a dedicated pole.
A variation of the third method was to place both cameras on the mast arm at the same height but with one covering the stop line area and the other the setback detection area. TTI collected data for several days at three locations: Elgin (50 mph), College Station (60 mph), and Cedar Park (65 mph) after installing all three of the major VIVDS products currently used by TxDOT.
Report Number:
0-5774-S
Electronic Link(s):
Document/Product
http://library.ctr.utexas.edu/hostedpdfs/txdot/psr/5774.pdf
Publication/Product Request
TTI reports and products are available for download at no charge. If an electronic version is not available and no instructions on how to obtain it are given, contact the TTI Library.