STUDY OF TRAFFIC FLOW ON SINGLE-CARRIAGEWAY ROADS WITH PARTICULAR REGARD TO SLOW VEHICLES

UNTERSUCHUNG DES VERKEHRSABLAUFS AUF EINBAHNIGEN STRASSES MIT BESONDERER BERUECKSICHTIGUNG LANGSAMER FAHRZEUG

Three different methodological approaches were employed to obtain generally valid conclusion: performance or evaluation of traffic measurements to determine macroscopic traffic parameters; performance of measurements for detailed analysis of overtaking maneuvers in response to slow cars; application of the microscopic simulation model SIMLA2 which was further developed here. The measurement results show that the differences between the cross-section types had less effect on speed/traffic density relationships than on overtaking activities. The influence of slow vehicles on traffic parameters is fairly slight in view of their normally low numbers. Measurements of overtaking maneuvers provide all the key variables for evaluation purposes. With regard to safety aspects it was particularly noticeable that in over 15% of cases drivers let no safety reserve in relation to oncoming traffic after overtaking. The simulation calculations provide models of traffic flow especially for boundary conditions noe covered by empirical tests. The study provides quantitative evidence of how pressure to overtake caused by slow vehicles can be reduced by means of specific cross-sectional forms. In general, it is concluded that variables concerning overtaking should be included in evaluations of rural highway cross-sections.

  • Corporate Authors:

    Technical University of Karlsruhe, West Germany

    Institut fuer Verkehrswesen
    D-7500 Karlsruhe,   Germany 
  • Authors:
    • BRANNOLTE, U
    • Schmidt, M
    • Baumann, N
  • Publication Date: 1989

Language

  • German

Media Info

  • Pagination: 122 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00623155
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Files: TRIS
  • Created Date: Jul 31 1992 12:00AM