Human Factors Guidelines for Road Systems - Collection C: Chapters 16, 17, 18, 19, 20, 22 (Tutorials 4, 5, 6), 23 (Updated), 24, 25, 26 (Updated) (2010) / Chapter Skim
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Countermeasures for Pavement/Shoulder Drop-offs
Countermeasures for Pavement/Shoulder Drop-offs
Pages 4-5
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From page 4... ...
The primary concern related to drop -offs is that if they are too high, then it can pose a crash risk if a vehicle drifts outside the road and has a wheel go over the drop-off. Design Guidelines Vertical or near-vertical shoulder drop-off heights that exceed the indicated table values warrant consideration for drop-off treatment or traffic control (in work zones; adapted from Graham & Glennon (3)
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From page 5... ...
Crash data analyses suggest that the overall frequency of crashes "probably" or "possibly" related to high drop-off is relatively low (less than 3% of rural road crashes for related road types) , but that these crashes tend to result in a greater proportion of fatalities or injuries than typical rural road crashes (4)
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