Citation

Lines CJ. Traffic Eng. Control 1993; 34(1): 2-7.

Affiliation

Transport Research Lab

Copyright

(Copyright © 1993, Hemming Group)

DOI

unavailable

PMID

unavailable

Abstract

In the 1970s the Transport Research Laboratory (TRL) undertook research on road humps that led to the standard U.K. hump design and the initial legislation that governed their use. With the increasing interest in traffic calming and the growing number of 20 mile per hour zones, it is an appropriate time to review this research and the changes in the regulations. TRL has recently obtained measurements of speeds on roads where circular-profile and flat-topped humps have been installed, and new relationships for speeds midway between the humps and hump separation have been derived. The results, while based on measurements from a large number of sites, are subject to a large degree of variability and should be considered as a guide only. It is likely that the relationships between speed and hump spacing will continue to change over time, and further studies will be needed in the future.