Overtaking lanes and stage duplication on two lane rural highways

Overtaking lanes offer a flexible method of rural road improvement which appears to be very cost effective. The main benefits which may be expected are a reduction in delays due to bunching, and increased driver comfort and safety. The benefits of bunch break up carry over for many kilometres downstream, and location may be chosen to minimise construction costs. This combination leads to substantial benefits at costs much lower that those of duplication or realignment. This paper discusses the results of a recent simulation study of overtaking lanes and alternative methods of rural road improvement. For road duplication projects, a consideration of marginal costs and benefits gives strong support for the use of stage construction, in order to make best use of limited road funds. Subsidiary benefits of overtaking lanes were seen to be (1) their flexibility in allowing a range of intermediate levels of road improvement to be undertaken between the two and four lane stages and (2) their appropriateness when funds are limited. The report also describes ongoing research into warrants for the length and spacing of auxiliary lanes.

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    Melbourne, Victoria  Australia 
  • Authors:
    • Hoban, C J
  • Publication Date: 1981-5


  • English

Media Info

  • Pagination: 28P
  • Serial:
    • Issue Number: AIR 359-3

Subject/Index Terms

Filing Info

  • Accession Number: 01438572
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Aug 24 2012 9:37PM