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原文传递 Yellow and Red Intervals to Improve Signal Timing Plans for Left-Turn Movement. Technical rept. 01 Sept 2001-31 Aug 2003.

题名：	Yellow and Red Intervals to Improve Signal Timing Plans for Left-Turn Movement. Technical rept. 01 Sept 2001-31 Aug 2003.
作者：	CHAUDHARY, N.; QIAO, F.; TIAN, Z. Z.; YU, L.; ZHANG, Y.
关键词：	Signalized-intersections; Traffic-signal-timing; *Left-turn-signals.;Traffic-simulation; Highway-transportation; Traffic-engineering; Highway-design; Traffic-safety; Texas-; Left-turns; Left-turn-lanes; Traffic-control-devices; Driver-behavior.
摘要：	This project developed and tested a framework for setting yellow change and red clearance intervals for the left-turn movement, which can be used directly by the field traffic engineers. The framework was designed to incorporate a comprehensive set of parameters related to intersection geometry, perception, human comfort, driver's behavior, safety issues, and traffic related laws. The application of this proposed framework can improve both the safety and the efficiency of the left-turn movement at the intersection. The field data collected from 21 intersections in 8 Texas cities was used for the preliminary calibration of three essential parameters within the improved framework. The three essential parameters are related to drivers' entering driving behavior, drivers' behavior on left-turn curve, and drivers' tolerable centrifugal force, respectively. After the preliminary calibration, a systematic calibration approach was designed to extend the improved framework to a wider range of intersection configurations associated with different approaching speed limits, number of left-turn lanes, control types, and truck percentages. Through this research it is found that the existing yellow change intervals for the left-turn movement should be shorter, and the existing red clearances longer. However, the existing total change intervals need not to be changed. This means that the safety of left-turn can be greatly improved without decreasing the efficiency of the entire intersection operation. This is the final report for the project, which summarizes the work that has been performed during the two-year project research.
报告类型：	科技报告