Radar Vehicle Detection and Shockwave Techniques for Signal Control of Closely Spaced Intersections

• Main Authors: Tseng, Ming-Te, 曾明德
• Other Authors: Cho, Hsun-Jung
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/67165154241295616210

博士 === 國立交通大學 === 運輸科技與管理學系 === 100 === A complementary metal-oxide semiconductor based radar with sensitivity time control antenna is successfully implemented for advanced traffic signal processing. The collected signals from the radar system are processed with developed optimization algorithms for vehicle-type classification and speed determination. In course of optimization, a video recognition module is further adopted as a supervisor of support vector machine and support vector regression. In the meanwhile, skew training data set and numerous classification scenarios are used to test the classifiers. Finally, the results are analyzed and compared. Beside, this investigation provides two traffic flow detection methods for oversaturated signalized intersection. The first method detects intersection shockwaves by innovative traffic parameters involving stopped duration, moving duration, and empty duration. The second method provides upstream arrival rate and speed by shockwaves, signal timing, and traffic flow model. This research has a contribution to the detection of shockwaves and upstream traffic parameters under over-saturated condition which traditional detectors cannot provide. Finally, a novel actuated critical path control model for designing signal timings on closely spaced intersections is presented in this study. Shockwaves are utilized to dynamically adjust maximal green time for each critical path with unstable traffic demands. Combined with path-based progression, this methodology suggests a novel way to deal with closely spaced intersections. A real network had been exemplified with micro-simulation to illustrate the effectiveness of the proposed method. The numerical example demonstrates a satisfying result compare to ordinary full-actuated scheme.