Citation

Donaldson G. ITE J. 1985; 55(9): 41-46.

Copyright

(Copyright © 1985, Institute of Transportation Engineers)

DOI

unavailable

PMID

unavailable

Abstract

Geometric design features are of pivotal importance to the operating safety of large trucks on two-lane, two-way roads. This review of sight distance formulae, stopping sight distance requirements for trucks, and superelevation specifications finds the AASHTO Green Book guidelines inadequate. In conclusion, it is pointed out that older two-lane, two-way roads are riddled with substandard, hazardous design and operating features, and the Green Book gives inadequate direction for their substantial improvement. Also pointed out is the lack of an approach to geometric design on older roads that rationally accommodates the actual ranges of legally licensable drivers and vehicles. Together, the facts pointed out in this article lead to the conclusion that on two-lane, two-way roads with significant curvature and grades, there is no vehicle more disfranchised from the protection that should be afforded any highway user than big trucks.