In order to investigate the relations between tyre track, type of roadway and road condition, velocity, loading conditions and mean deceleration, a total of 10 lorries and buses were subjected to braking tests. In all, 201 experiments (150 with lorries, 51 with buses) were carried out. In 93% of the experiments one or both axles locked. For most of the buses the wheels did not lock. In the case of lorries the tendency of the front wheels to lock on a dry roadway is independent of the loading condition, on a wet roadway it increases with increasing load. The tendency for the rear axle to lock on a dry roadway is higher than on a wet one. Variations in the locking tendency is greatly dependent on vehicle type. The mean total deceleration of lorries in the unladen state decreases with increasing dead weight on asphalt roadways. The decreasing tendency of deceleration values with increasing load was shown distinctly in the lorry experiments, in the case of the buses it could be seen only on asphalt. Load distribution is of importance insofar as the decelerations for loads placed at the rear are lower, quite independent of the velocity. For 5 of the 8 lorries rear wheel rebounding occurred, and mostly in the empty and partially loaded condition, as well as on dry flexible pavements. Rebounding of the rear wheels did not lead to a lower deceleration. It is pointed out that variations of the parameters could not be carried out completely due to reasons of time and costs. /TRRL/

  • Corporate Authors:

    Information Verlag

    Obere Hauptstrasse 13, Postfach 131
    D-7634 Kippenheim,   Germany 
  • Authors:
    • Wanderer, U
    • KRUEGER, H J
  • Publication Date: 1977-11


  • German

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 215-9
  • Serial:
    • Verkehrsunfall
    • Volume: 15
    • Issue Number: 11
    • Publisher: Information Verlag

Subject/Index Terms

Filing Info

  • Accession Number: 00194104
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Jun 13 1979 12:00AM