Guidelines for Timing Yellow and All-Red Intervals at Signalized Intersections (2012) / Chapter Skim
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Pages 77-84
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From page 77... ...
77 A p p e n d i x F Effect of 1-Second Red Clearance Interval Reduction on Intersection Clearance Posted Speed Limit + 7 mph (estim ate of the 85th percentile speed) The tables show the calculated red clearance interval (in seconds)
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From page 78... ...
78 Front bumper position at the end of the red clearance interval considering 4-foot stop line setback Front bumper position at the end of the red clearance interval considering 30-foot stop line setback The final tables show the difference between the front bumper position at the end of the red clearance interval and the intersection width (in feet)
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From page 79... ...
79 In all scenarios, the clearing driver has exited the intersection by the end of the 1-second of start-up delay. The analysis shows that more drivers are able to traverse beyond the intersection during the red clearance interval and fewer drivers are clearing the intersection at the end of the 1-second start-up delay when stop line setback is the minimum distance of 4 feet.
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From page 80... ...
80 V = 30 mph + 7 mph = 37 mph (54.39 fps) (1.0-second minimum)
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From page 81... ...
81 Posted Speed Limit The tables show the calculated red clearance interval (in seconds) assuming the approach speed is assumed to equal the respective posted speed limit (V)
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From page 82... ...
82 The next tables show the front bumper position (in feet) of a vehicle passing through an intersection during the red clearance interval.
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From page 83... ...
83 Difference between front bumper position and intersection width considering 30-foot stop line setback Similar to the estimated 85th percentile speed analysis, the clearing driver has exited the intersection by the end of the 1-second of start-up delay in all scenarios. Additionally, the analysis shows that more drivers are able to traverse beyond the intersection during the red clearance interval and fewer drivers are clearing the intersection at the end of the 1-second start-up delay when stop line setback is the minimum distance of 4 feet.
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From page 84... ...
Abbreviations and acronyms used without definitions in TRB publications: AAAE American Association of Airport Executives AASHO American Association of State Highway Officials AASHTO American Association of State Highway and Transportation Officials ACI–NA Airports Council International–North America ACRP Airport Cooperative Research Program ADA Americans with Disabilities Act APTA American Public Transportation Association ASCE American Society of Civil Engineers ASME American Society of Mechanical Engineers ASTM American Society for Testing and Materials ATA American Trucking Associations CTAA Community Transportation Association of America CTBSSP Commercial Truck and Bus Safety Synthesis Program DHS Department of Homeland Security DOE Department of Energy EPA Environmental Protection Agency FAA Federal Aviation Administration FHWA Federal Highway Administration FMCSA Federal Motor Carrier Safety Administration FRA Federal Railroad Administration FTA Federal Transit Administration HMCRP Hazardous Materials Cooperative Research Program IEEE Institute of Electrical and Electronics Engineers ISTEA Intermodal Surface Transportation Efficiency Act of 1991 ITE Institute of Transportation Engineers NASA National Aeronautics and Space Administration NASAO National Association of State Aviation Officials NCFRP National Cooperative Freight Research Program NCHRP National Cooperative Highway Research Program NHTSA National Highway Traffic Safety Administration NTSB National Transportation Safety Board PHMSA Pipeline and Hazardous Materials Safety Administration RITA Research and Innovative Technology Administration SAE Society of Automotive Engineers SAFETEA-LU Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (2005) TCRP Transit Cooperative Research Program TEA-21 Transportation Equity Act for the 21st Century (1998)
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