A model of speed profiles for traffic calmed roads

  • Published: Transportation Research Part A, 2000
  • Authors: H.M. Barbosa, M.R. Tight and A.D. May
  • Date Added: 05 Feb 2013
  • Last Update: 20 Mar 2013
  • Format: pdf


To assess the influence of traffic calming measures on the speed of unimpeded vehicles by evaluating differences in speed profiles obtained from various combinations of traffic calming measures.


The study was undertaken by evaluating the differences in speed profiles obtained from the various combinations of traffic calming measures (humps, speed cushions, and chicanes implemented in sequence. The emphasis was on creating an empirical model which explains the variations in speed profiles according to the type and position of measures within the sequence.

Key Findings:

  • An examination of the effects of different types of traffic calming measures on speeds has showed differences by type of measure.

  • The greatest impact on speeds was produced by tables, followed by humps, chicanes and cushions.

  • This confirms the order of effectiveness seen by Layfield (1994).

  • However, some variation was seen between measures of the same type indicating that their location can impact their effectiveness.

  • This study has also produced evidence that some chicanes are totally ineffective in reducing speeds.


Traffic calming, Speed reduction.


The research was predominantly aimed at developing a model to predict the speed reductions achieved by proposed traffic calming measures but some of the information discussed is relevant to the synthesis.