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原文传递 VISSIM Calibration for Urban Freeways. Tech Transfer Summary.

题名：	VISSIM Calibration for Urban Freeways. Tech Transfer Summary.
作者：	Dong, J.; Houchin, A.; Shafieirad, N.; Lu, C.; Hawkins, N.; Knickerbocker, S.
关键词：	Urban freeways, Weaving section configurations, Interchange types, Merge areas, Traffic microsimulation, Traffic conditions, Headways, VISSIM microscopic simulator
摘要：	Providing adequate roadway capacity, particularly in high-volume conditions, is an essential component of mobility, safety, and the stewardship of public funds for transportation. In urban areas, interchange spacing and the adequacy of design for weaving, merge, and diverge areas can significantly impact the available capacity. Traffic microsimulation tools such as VISSIM allow detailed analyses of these critical areas in complex locations. In order to obtain valid results, however, various inputs must be calibrated to local conditions. The resulting calibration factors can enable a higher level of fidelity in modeling traffic behavior and help balance need with investment. Two crucial inputs to calibrate VISSIM are standstill distance and headway. Standstill distance, the distance between stopped vehicles, indicates the maximum traffic density on a roadway section, in that vehicles are as close together as possible. Headway, the elapsed time between the front bumper of the leading vehicle and the front bumper of the following vehicle, indicates the capacity of a roadway section; when all vehicles are at their headway, any additional traffic density causes vehicles to begin braking, which in turn causes congestion. Time gap is similar but is defined as the elapsed time between the back bumper of the leading vehicle and the front bumper of the following vehicle.
总页数：	Dong, J.; Houchin, A.; Shafieirad, N.; Lu, C.; Hawkins, N.; Knickerbocker, S.
报告类型：	科技报告