Citation

Billion CE, Parsons NC. Highw. Res. Board bull. 1962; 308: 64-79.

Copyright

(Copyright © 1962, National Research Council (U.S.A.), Highway Research Board)

DOI

unavailable

PMID

unavailable

Abstract

The effect was studied of median design on accident rates for divided urban highways carrying volumes up to 44,000 vehicles per day and having unrestricted roadside access.

RESULTS were (1) there appears to be no correlation between accident rates and width of deterring-type medians between intersections, (2) accident rates increased linearly with traffic volumes for deterring types of medians between intersections, (3) the overtaking type of accident accounted for 70% of the accidents between intersections for both deterring and non-traversable types of median, (4) on highways with deterring curbed medians and without illumination, the night intersection accident rate is twice that of the day rate, whereas on highways with illumination, the night and day rates are the same, (5) medians with double beam rails had the lowest accident rates, and (6) on highways having deterring-type medians, the curbed median section has nearly 2 and one half times the accident ratio of the earth median for all intersections between intersections.