Merging on to High Speed Roads

  • R. J. Salter


Describe how the capacity of merging links to high speed roads may be estimated. A single lane link merges with a two lane highway and the merging relationship between entering link flow and upstream main carriageway flow is
$${\rm{Link entry flow = 1600 - 0}}{\rm{.44 upstream flow}}$$
Develop a diagram illustrating the variation of link entry capacity with mainline flow.


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  1. (1).
    Highway Capacity Manual. Transportation Research Board. Washington, 1985.Google Scholar
  2. (2).
    Department of Transport. Layout of Grade Separated Junctions. Departmental Standard TD22/86. London 1986.Google Scholar

Copyright information

© R. J. Salter 1989

Authors and Affiliations

  • R. J. Salter
    • 1
  1. 1.University of BradfordUK

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