OVERCOMING OBSTACLES TO THE USE OF TRAFFIC SIGNAL DETECTOR DATA FOR TRAFFIC FORECASTING

摘要: North Carolina Department of Transportation (NCDOT) traffic engineers use inductive loop detectors in order to provide efficient signal timing at signalized intersections that do not assign right-of-way under a fixed time division framework. As vehicles travel over the electrified loops, amplifiers cabinet detect changes vehicle inductance. The controller uses this demand information transmitted from modify on cycle-by-cycle basis. When loops are working properly and scheme is appropriate, result very operation an at-grade intersection. NCDOT Traffic Survey Unit (TSU) collects vast majority data for Department. Individuals organizations demanding ever more current, detailed, accessible TSU. Unfortunately, limited human resources hamper ability TSU collect as often, many locations, desired. In addition, additional challenges complexity safety personnel. possibility adding detector counts mix available appealing ITRE have conducted study into advanced counting purposes. With cooperation Reno A&E, electronics vendor, tested standard (dual-output) variety settings Wake County. This report provides brief primer operations engineering, since it important understand, least general way, how signals timed what role inductance detection plays. continues with some background regarding controllers used implement field. document also contains literature review, describing efforts by other areas regard. summary user's workshop held 1999. then offers detailed field experiments 1999, 2000, 2001. paper specific recommendations implementation, grouped category. apply both NEMA TS-1 TS-2 cabinets. Regarding concerning accuracy, authors identified high level congruence between manual 6' x stretch during our tests. Therefore, their overall recommendation begin using (far) rewiring cabinets installing count outputs needed They substantial variation quadrupoles (tied can changes) count-defined "ground truth" several cases, so they recommend time. retain rectangular (square) shapes.