The National Academies

NCHRP 25-47 [Active]

How to Measure and Communicate the Value of Access Management

  Project Data
Funds: $600,000
Staff Responsibility: Leslie C. Harwood
Research Agency: University of South Florida
Principal Investigator: Kristine M. Williams
Effective Date: 8/2/2018
Completion Date: 3/31/2021
Comments: Research in progress.


Effective management of ingress and egress along highways and major arterial roadways is essential for minimizing potential road user conflicts caused by closely spaced curb cuts, median openings across a turn lane, driveways in a major intersection, or poorly coordinated traffic signals and other poorly designed access features that may contribute to unsafe and congested roadways. Access management techniques—used to minimize these potential points of conflict control access—increase roadway capacity, reduce crashes, and help manage congestion.
Potential economic benefits of access management include: reducing the cost of delivering an efficient and safe transportation system; reducing the need for road widening, which could displace businesses, homes, and communities; shortening transport times for delivery carriers; encouraging more stable property values; preserving investments made in transportation facilities; reducing capital improvement costs for new or reconstructed roadways; and reducing the time needed to conduct internal and inter-governmental coordination.
Research on the benefits of access management has focused mainly on operational and safety effects. Research related to the economic impact of access management typically concentrated on addressing the concerns of business owners whose properties have been impacted by access changes. There has been little focus on the economic impacts to transportation agencies that may result from poor access management decisions or the lack of access management planning. Transportation agencies that do not successfully implement access management may incur additional costs for superfluous geometric design or operations modifications such as the installation of a traffic signal, a median, or a right- or left-turn lane; major roadway widening; constructing a bypass or new interchange; or potential liabilities including those related to congestion and crashes or from mitigating adverse effects of development-related traffic. Research is needed to help agencies—charged with making prudent access management decisions—demonstrate and articulate the benefits and costs of access management at the program, corridor, and project levels.
The objective of this research is to develop guidance for transportation agencies on identifying and communicating the value of access management at the program, corridor, and project levels. The guidance will involve techniques to identify, measure, and assess the benefits and costs of access management using both quantitative and qualitative metrics.
STATUS (February 2021)

Final deliverables are being revised for review.

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