CHANGES IN TRAFFIC FLOW WITH SPEED RESTRICTIONS OF 130 KM/H ON NINE SECTIONS OF THE FEDERAL MOTORWAYS

VERAENDERUNGEN IM VERKEHRSABLAUF BEI HOECHSTGESCHWINDIGKE 130 KM/H AUF NEUN BUNDESAUTOBAHNABSCHNITTEN

Traffic flow data collected from roads having an advisory speed of 130 km/h have been compared with data from roads subject to the "speed 130" restriction, in order that the changes in the various elements of traffic movement could be identified. The basis for this was abstracted from the sample surveys made on nine lengths of motorway as part of the "speed 130" research programme. In general it was shown that traffic behaviour was mainly influenced by traffic volume, form which a speed level is evolved, based upon highway characteristics and the desired speed. Only a very considerable speed restriction generally has any effect upon traffic behaviour; then, simultaneously with the homogenization of the traffic pattern, the influence of traffic flow upon behaviour will be reduced. Such a condition cannot however, as the analysis shows, be achieved by a speed restriction of 130 km/h. The effects of "speed 130" are particularly noticeable in regard to speed - on the overtaking lane higher speeds are less frequent that in the case of advisory limits - but bunching, lane changing and overtaking are not noticeably different whichever regulations apply. A speed restriction of 130 km/h does not appear to have had any great effect on traffic flow; the clearance between vehicles in the case of the vast majority of drivers in the "speed 130" situations is not significantly different to that when the advisory limit applies.

  • Availability:
  • Corporate Authors:

    Tetzlaff Verlag GmbH

    Havelstrosse 9, Postfach 4006
    D-6100 Darmstadt 1,   Germany 
  • Authors:
    • KELLER, H
  • Publication Date: 1979

Language

  • German

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00325424
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: May 21 1981 12:00AM