Citation

Dunn RE. Highw. Res. Board bull. 1955; 104: 12-20.

Copyright

(Copyright © 1955, National Research Council (U.S.A.), Highway Research Board)

DOI

unavailable

PMID

unavailable

Abstract

The purpose of this paper is to present a graphical type of analysis that was developed to provide sufficient information within reasonable time and cost limits for the determination of the proper location of climbing-lane termini. The procedure employs various types of traffic studies to develop a profile of the average running speeds of commercial vehicles and unimpeded passenger cars and a measurement of the additional travel-time required by the overtaking and passing maneuvers of delayed traffic. The graphical analysis determines: (1) the length of the impeding zone within which the grade effects a reduction in the normal speed of trucks, (2) the proper positioning of a climbing lane based upon selected acceptable speed differentials between passenger cars and trucks, and (3) the rating of ascending grades through an economic comparison of time-delay and accident costs of motor vehicle operation. The conclusion of this research is that it is an economical and dependable method of obtaining such supplemental information as may be required for the planning, programming and construction of safe and efficient highway facilities.