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原文传递 A FURTHER INVESTIGATION ON CRITICAL GAP AND FOLLOW-UP TIME.

题名：	A FURTHER INVESTIGATION ON CRITICAL GAP AND FOLLOW-UP TIME.
作者：	Tian-ZZ; Troutbeck-R; Kyte-M; Brilon-W; Vandehey-M; Kittelson-W; Robinson-B
关键词：	Critical-gap; Follow-up-time; Geometric-design; Highway-Capacity-Manual; Highway-capacity; Highway-grades; Level-of-service; Regression-analysis; Traffic-flow; Two-way-stop-controlled-intersections; Unsignalized-intersections; Vehicle-classification
摘要：	The 1997 update to the "Highway Capacity Manual" (HCM) includes a new set of critical gap and follow-up time values calibrated based on the U.S. conditions. This paper is to present the detailed investigation on various factors affecting the critical gap and follow-up time, so that users can have a better understanding of the recommended critical gap and follow-up time values. The investigation was based on the comprehensive database established during the NCHRP 3-46 project, Capacity and Level of Service at Unsignalized Intersections. The paper first identifies various factors that might affect critical gap and follow-up time, such as intersection geometry, traffic movements, vehicle type, speed limits, and delay. Step-wise regression technique is then applied to identify the significance of these various factors. The relationship between critical gap and follow-up time values is also investigated. It is found that the major factors affecting critical gap and follow-up time include intersection geometry, vehicle type, approach grade, and traffic movements. While an independent set of follow-up time values are recommended, the follow-up time to critical gap ratio is found to be approximately 0.60, which has been reported in previous studies. The newly recommended set of critical gap and follow-up time values form the basis for the procedures for two-way stop-controlled intersections included in the 1997 update to the HCM and the 2000 HCM.
总页数：	Conference Title: Fourth International Symposium on Highway Capacity. Location: Maui, Hawaii. Sponsored by: Transportation Research Board. Held: 20000627-20000701. Transportation Research Circular. 2000/06. pp397-408 (2 Fig., 6 Tab., Refs.)
报告类型：	科技报告