OVERTAKING DESIGN SIGHT DISTANCES AND BARRIER LINE WARRANTS

Design codes for overtaking sight distance on two-lane rural roads and manuals of traffic control devices tend to view the overtaking manoeuvre from different perspectives. This report reviews both design overtaking sight distances and the warrants for barrier lines, and recommends a unified set of design principles and warrants. These recommendations are based on existing Australian design rules and barrier line installation practices and on the observation of 3150 overtakings around vehicles 5 to 21M in length. The principal assumption is that, at most points along a road, the sight distance should be sufficient for most motorists (85 per cent) to be able to complete or abort the manoeuvre from the point of no-return. If this sight distance cannot be provided then it is considered that a barrier line ought to be used. Additionally, at frequent points along the road, sufficient distance should be provided for most motorists to initiate an overtaking manoeuvre. The recommended barrier line warrants allow drivers to complete the manoeuvre from the point of no-return without crossing barrier lines. Conspicuity and advance warning of barrier lines are also discussed. (TRRL)

  • Supplemental Notes:
    • See also HS-029 092, HS-029 094, and HS-029 104--HS-029 107.
  • Corporate Authors:

    ARRB Group Ltd.

    Vermont South, Victoria  Australia 
  • Authors:
    • Troutbeck, R J
  • Publication Date: 1979-9

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 47 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00310026
  • Record Type: Publication
  • Source Agency: ARRB Group Ltd.
  • Report/Paper Numbers: AIR 197-10 Monograph, HS-029 093
  • Files: HSL, ITRD, TRIS, ATRI
  • Created Date: Jul 22 1984 12:00AM