Human Factors Guidelines for Road Systems: Second Edition (2012) / Chapter Skim
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Pages 144-152
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Passing Lanes .
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PASSING LANES Introduction A passing lane is a lane added in one or both directions of travel on a two-lane, two-way highway to improve passing opportunities. This definition includes passing lanes in level or rolling terrain, climbing lanes on grades, and short fourlane sections (1)
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Discussion Two-lane highways with passing lanes provide a definite improvement in level of service over those without passing lanes (2)
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COUNTERMEASURES FOR PAVEMENT/SHOULDER DROP-OFFS Introduction A shoulder is a portion of the roadway contiguous with the traveled way for accommodation of stopped vehicles, for emergency use, and for lateral support of the sub-base, base, and surface courses. The roadway shoulder has been recognized as desirable ever since engineers began paving roadways.
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Discussion A primary safety concern related to drop-off from the perspective of driver performance occurs when a vehicle leaves the lane and has a tire go over the drop-off (typically the front right tire)
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R UMBLE S TRIPS Introduction Shoulder rumble strips (SRS) are raised or grooved patterns on the shoulder of a travel lane intended to provide a tactile/haptic and auditory alert to drivers who stray onto the shoulder.
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Discussion Torbic et al.
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DESIGN CONSISTENCY IN RURAL DRIVING Introduction Design consistency refers to the conformance of a highway's geometric and operational features with driver expectancy (1)
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Discussion As noted on the previous page, design consistency refers to the conformance of a highway's geometric and operational features with driver expectancy (1)
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Key Terms
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