Guidelines for Timing Yellow and All-Red Intervals at Signalized Intersections (2012) / Chapter Skim
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Pages 6-10
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From page 6... ...
6This chapter provides a discussion of the basic principles of yellow change and red clearance intervals and how they have been determined in earlier and current guidelines and manuals. The change interval can consist of two components: the yellow change interval and, if used, the red clearance interval.
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7 the yellow signal indication. Figure 2 illustrates the Type II dilemma zone concept.
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8ITE and FHWA suggest using the equations provided in the ITE Traffic Engineering Handbook. While each publication recommends using a consistent method (i.e., the kinematic equation)
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9 Where: R = red interval (s) , V = design speed (ft/s)
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10 interval equal to the first two terms of the equation. Likewise, the Guide notes that some agencies use the third term of the equation to calculate the duration of the red interval.
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