Guidelines for Timing Yellow and All-Red Intervals at Signalized Intersections (2012) / Chapter Skim
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1 Guidelines for Timing Yellow and All-Red Intervals at Signalized Intersections For over 70 years, the subject of yellow and red signal indications has been a popular topic among scholars and professionals in the traffic engineering field. There has been much discussion throughout the industry and those associated with it about how to address the numerous issues and factors involved with developing change interval timing procedures that provide intersection safety while maintaining an acceptable level of operational efficiency.
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2Fundamental driver behavior studies related to characteristics influencing the yellow change and red clearance intervals were performed more than 25 years ago. To verify that accurate values were being used in the timing of these intervals, an extensive field investigation of driver behaviors was conducted.
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3 In conclusion, the duration of the yellow change and red clearance intervals has an impact on driver behavior and intersection safety. The survey results and the review of published literature confirmed that agencies responsible for change interval timing take a widely varied approach in their practices.
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