Guidelines for Timing Yellow and All-Red Intervals at Signalized Intersections (2012) / Chapter Skim
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Pages 56-59
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56 A p p e n d i x A Guidelines for Timing Yellow and All-Red Intervals at Signalized Intersections The yellow change interval is the period of time following the green signal indication during which a yellow signal indication is displayed. The red clearance interval is the period of time that follows the yellow signal indication during which a red signal indication is displayed to all conflicting movements at an intersection.
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57 Table A Yellow Change Interval (seconds)
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58 • If the calculated red clearance interval is greater than 1.0 seconds, then the implemented duration should be as calculated. For Left-Turn Movements Yellow change and red clearance intervals for left-turn movements should be calculated using Equations A and B with the following modified parameters: Yellow Change Interval V = approach speed (mph)
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From page 59... ...
59 Unusual Conditions While the guidelines are based on typical roadway and driver conditions, there may be instances when exceptions are necessary to accommodate unusual conditions. Under these circumstances, the engineer or practitioner may exercise "engineering judgment" to determine that the conditions warrant the use of other calculation or implementation practices than those presented in the guideline.
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