Operational Impacts of Implementing Auxiliary Lanes at Isolated Freeway Off -Ramps

An auxiliary lane (AL) at a freeway off-ramp refers to the deceleration lane immediately upstream of the off-ramp. Vehicles exiting the freeway can use the additional space in the AL to safely move from the travel lane and decelerate to the appropriate ramp speed. This reduces the potential for bottlenecks to occur. The objective of this paper is to evaluate the operational performance of isolated freeway off-ramp junctions with different design scenarios that consider different lengths of ALs and traffic demand (e.g., freeway and ramp volumes). Recommendations on the conditions under which an AL should be included in the off-ramp junction design will be developed.

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  • Supplemental Notes:
    • Abstract reprinted with permission from the Institute of Transportation Engineers.
  • Authors:
    • Wang, Yubian
    • Cheu, Ruey Long
  • Publication Date: 2016-8


  • English

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  • Accession Number: 01609497
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 4 2016 2:20PM