This paper summarises the history and development of the roundabout from its inception to the present day. The first section describes early development, much of which has not been reviewed before. Tracing the early rule-of-thumb design, it shows how experience and research developed an efficient form of junction control, which became impracticable only when it became impossible to provide the increasingly large spaces required to construct roundabouts capable of handling constantly increasing traffic volumes. The second section reviews the revolutionary changes and developments in roundabout design made possible by the change from weaving to offside priority operation and summarises current design criteria and capacity prediction formulae. Finally, a brief look is taken into the future to try to assess how the roundabout will be used and what research still needs to be done. (TRRL)

  • Availability:
  • Corporate Authors:

    Whitehall Press Limited

    Headington Hill Hall
    Oxford 0X3 0BW,   England 
  • Authors:
  • Publication Date: 1980-5

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 2-10
  • Serial:
    • Highway Engineer
    • Volume: 27
    • Issue Number: 5
    • Publisher: Whitehall Press Limited
    • ISSN: 0306-6452

Subject/Index Terms

Filing Info

  • Accession Number: 00319611
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Report/Paper Numbers: ANALYTIC
  • Files: ITRD, TRIS
  • Created Date: Jan 19 1981 12:00AM