The impacts of various urban speed-reducing measures on driving speeds at single sites are described quantitatively based on a literature review. The measures in the review included speed limits, physical measures like humps and road narrowings, roundabouts, reconstruction of residential streets and through roads in small villages, and area-wide traffic calming schemes. Altogether the impacts on mean speed at single sites varied from a 5 km/h increase to a 27 km/h decrease. There were large variations in the impacts between measures of different types, but also between same type of measures. The results show that speeds of 30 km/h or less can be achieved with careful planning and use of tailored combinations of measures. Reduction of a speed limit without other supportive measures seldom has the desired effect. The effect on safety can be faster and usually more reliably estimated from speed changes than from accident statistics. The reviewed speed-reducing schemes did not always have an explicit speed target. Many studies reported the impacts on speed superficially, and many lacked all reference to actual speeds. Issues of importance for consideration by planners of urban speed-reducing schemes and those studying their effects are discussed.

  • Supplemental Notes:
    • The publisher's German name is Forschungsgesellschaft fur Strassen- und Verkehrswesen (FGSV).
  • Corporate Authors:

    Road and Transportation Research Association

    Postbox 50 13 62
    D-50973 Cologne,   Germany 
  • Authors:
    • Kallberg, V-P
    • RANTA, S
  • Conference:
  • Publication Date: 2000-6


  • English

Media Info

  • Features: Figures; References;
  • Pagination: p. 93-109

Subject/Index Terms

Filing Info

  • Accession Number: 00794770
  • Record Type: Publication
  • Report/Paper Numbers: FGSV 002/67
  • Files: TRIS
  • Created Date: Jun 23 2000 12:00AM