Human Factors Guidelines for Road Systems: Second Edition (2012) / Chapter Skim
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Pages 59-65
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From page 59... ...
Design Considerations for Turnouts on Grades .
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D ES IG N C ON SI DE RA TI ON S FO R T UR NO UT S ON G RA DE S In tr od uc ti on Turnouts are widened, unobstructed shoulder areas that allow slow-m oving vehicles to pull out of the through lane to give passing opportunities to following vehicles ( 1 )
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Discussion Turnouts may be utilized more by recreational vehicles and slower passenger cars, while heavy truck drivers are not likely to use them at all (2)
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G EO ME TR IC AN D S IG NI NG C ON SI DE RA TI ON S TO S U PPO RT E FFE CT IV E U SE OF T RU CK E SC AP E R AM PS In tr od uc ti on A Truck Escape Ramp (TER) is a facility designed and constructed to provide a location for out-of-control trucks (though other vehicles can use them as well)
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Di scu ssi on As noted on the previous page, AASHTO ( 1 ) provides comprehensive guidance regarding the design and location of em ergency escape ram ps in the "Elem ent of Design" chapter.
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From page 64... ...
PREVIEW SIGHT DISTANCE AND GRADE PERCEPTION AT VERTICAL CURVES Introduction The preview sight distance (PVSD) is a measure of driver sight distance based on the assumption that "the driver views or previews the roadway surface and other cues that lie ahead to obtain the information needed for vehicular control and guidance" ( 1 )
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From page 65... ...
Discussion The PVSD reflects sight distance needs apart from the typical sight distance requirements, such as stopping sight distance, decision sight distance, passing sight distance, and intersection sight distance. In particular, it addresses the adequate view of the roadway alignment, pavement surface, and other features that provide the vehicle control and guidance cues that drivers need to have a relaxed, comfortable, and safe ride (1)
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