Citation

Easa S. ITE J. 1993; 63(8): 37-46.

Copyright

(Copyright © 1993, Institute of Transportation Engineers)

DOI

unavailable

PMID

unavailable

Abstract

A study considered two cases in the evaluation of sight distance for railroad grade crossings. The first addressed the sight distances required along the highway and the railroad for an approaching vehicle, and the second, addressed the sight distance required along the railroad tracks for a stopped vehicle at the crossing stop line. This article describes the first case which considers the approach vehicle speed. The details of the study are described, and the findings are presented and discussed. It was found that vehicle 15-percentile speed should be used in computing the sight distance leg along the railroad when the vehicle average speed is less than about 33 mph. For higher vehicle speeds, the 85-percentile speed should be used, unless the coefficient of variation of vehicle speed is large. A graph for finding which speed should be used, is presented.