Citation

Stohner WR. Highw. Res. Board bull. 1956; 139: 79-84.

Copyright

(Copyright © 1956, National Research Council (U.S.A.), Highway Research Board)

DOI

unavailable

PMID

unavailable

Abstract

A study was conducted in New York of speeds on wet and dry pavements. All study locations were on open rural highways removed from the influence of intersections and with a minimum of interference from roadside development. Passenger car speeds were tabulated according to the site whether on tangent or curved location, for both wet and dry pavement conditions. Cumulative speed distribution curves were plotted for each location studied. These figures showed that there is very little difference in the speed distributions of free-moving passenger cars on wet and dry pavements. This was found to be true on macadam and black top surfaces as well as on the portland cement concrete surfaces. even though the speed of free-moving passenger cars is not generally reduced on wet pavements, an analysis of speed and the coefficients of side friction actually developed shows that most drivers of passenger cars do not exceed the design coefficient of side friction recommended by AASHO.