A MODEL OF SPEED PROFILES FOR TRAFFIC CALMED ROADS

The influence of traffic calming measures (TCMs) on the speed of unimpeded vehicles has been investigated by evaluating differences in speed profiles obtained from various combinations of these measures. A case study has been conducted in the City of York (UK) focusing on TCMs such as speed humps, speed cushions, and chicanes implemented in sequence. Vehicles' passing times were simultaneously recorded at 16 points along each traffic-calmed link. From this data, a speed profile for each individual vehicle could be derived. An empirical model was developed using multiple regression analysis techniques based on data collected at 3 calibration sites. Speeds along these links were described as a function of the input speed, the type of measure, and the distance between measures. The speed profile model was shown to be a good representation for the data from the calibration sites. It efficiently predicted speeds of unimpeded vehicles over a given combination of TCMs in sequence. The validation process, based on data collected at 3 validation sites, also indicated that the model provided a good representation of the observed profiles at these sites, with the exception of the prediction of the effects of the chicanes on speeds. This type of measure was shown to produce diverse impacts on speeds which depended on the detailed design. While the model is a useful design tool, recommendations have been made for further enhancement to it.

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  • Corporate Authors:

    Elsevier

    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • Barbosa, H M
    • Tight, M R
    • May, A D
  • Publication Date: 2000-2

Language

  • English

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Filing Info

  • Accession Number: 00789472
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Mar 18 2000 12:00AM