The National Academies

NCHRP 07-23 [Final]

Access Management in the Vicinity of Interchanges

  Project Data
Funds: $950,000
Research Agency: Texas A&M Transportation Institute
Principal Investigator: Dr. Karen Dixon
Effective Date: 6/20/2013
Completion Date: 12/15/2019
Comments: Final report NCHRP Research Report 977 Volumes 1 and 2 are available.

Transportation agencies use access management techniques to balance the required mobility of a roadway facility with the accessibility needs of the adjacent land users. Operational and safety problems can result when driveways and intersections on crossroads are spaced too closely to interchange terminals. In 2004, TRB published NCHRP Synthesis 332: Access Management on Crossroads in the Vicinity of Interchanges. Since 2004 there have also been advances in intersection and interchange types and new resources to estimate safety and operational impacts. Synthesis 332 also identified research gaps that limit the ability of transportation professionals to successfully implement sound access management practices. This study aimed to (1) develop  a guide for access management in the vicinity of a freeway interchange, and (2) provide suggested language for revisions to relevant manuals such as the AASHTO Policy on Geometric Design for Roads and Streets, and the Highway Safety Manual
NCHRP Research Report 977: Access Management in the Vicinity of Interchanges, Volume 1: Practitioner’s Guide, NCHRP Research Report 977: Access Management in the Vicinity of Interchanges, Volume 2: Research Overview; a suite of PowerPoint slides, and an Access Management Interchange Decision Tool are now available.

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