Guidelines for Timing Yellow and All-Red Intervals at Signalized Intersections (2012) / Chapter Skim
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Pages 11-16
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From page 11... ...
11 This chapter presents the summary findings from a review of available previously published literature to understand the state of knowledge for change interval timing and the associated factors that affect how yellow change and red clearance intervals are determined and implemented. The review summarizes research related to interval calculations, PRTs, deceleration rates, approach speeds, and any other factors that may affect the timing of yellow change and red clearance intervals.
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From page 12... ...
12 Traffic Signals (19) provides a comprehensive review of these models and formative research prior to the kinematic model.
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From page 13... ...
13 intersections. The study concluded that yellow change and red clearance intervals for left-turn phases are typically incorrect if they are computed based on through movements.
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14 conflict point. The 1965 edition of the Traffic Engineering Handbook (36)
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From page 15... ...
15 on crashes, based on better designed before–after studies, is about an 8 to 14 percent reduction in total crashes, and about a 12 percent decrease in injury crashes. Some studies report evidence of increased risk of rear-end crashes when yellow change interval duration is increased, which may reflect the increased exposure of drivers to this decision period.
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From page 16... ...
16 Issue Findings Effect of Change Intervals on Driver Behavior -Behavior influenced by traffic speed and volum e, signal timing and coordination, nu mb er of lanes (i.e., intersection width) , vehicle type, age, and gender of driver.
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