Citation

Billion CE. Highw. Res. Board bull. 1956; 137: 1-17.

Copyright

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

DOI

unavailable

PMID

unavailable

Abstract

There is quite a difference of opinion among highway engineers regarding the relative merits and effectiveness of the different types and widths of median dividers. Technical questions have been raised as to whether or not the wall type median is desirable and as to the proper width of each of the two lanes for one direction of travel on a 4-lane divided highway. A study was conducted in new york in an attempt to obtain factual information on the subject. Vehicle speeds and placements were recorded in 1950 during daylight hours at 18 sites on the long island parkway system, a 4-lane divided parkway, carrying volumes as high as 2,800 vehicles per hour in one direction of travel. Six types of median traffic dividers were studied and the results were the basis of the preliminary report. Additional data were recorded in 1951 at four of the original sites and at four other sites on rural 4-lane divided highways near albany. The 1951 study included both day and night observations.