Citation

Fisher RL. Highw. Res. Board bull. 1961; 291: 124-138.

Copyright

(Copyright © 1961, National Research Council (U.S.A.), Highway Research Board)

DOI

unavailable

PMID

unavailable

Abstract

Geometric highway design can be evaluated only if the relative merits of the design features can be measured in some fashion. A yardstick is needed that will measure the various design features. Studies have been under way for the past two years to evaluate interchanges by three means- accident records, operation, and capacity. Interchanges can be broken down into three basic elements: (1) the exit terminal, (2) the main portion of the ramp, and (3) the entrance terminal. This paper attempts to show how a variation in the design of these basic elements affects operation and safety.