The National Academies

SHRP 2 L11 [Completed]

Evaluating Alternative Operations Strategies to Improve Travel Time Reliability

  Project Data
Funds: $1,000,000
Research Agency: Kittelson & Associates
Principal Investigator: John Zegeer
Effective Date: 9/3/2008
Completion Date: 3/4/2011

Project snapshot. More details below.

(Project Number)
Impact on Practice
Product Status

A report useful for planning and systems engineering with regard to travel time reliability. It sets out requirements for reliability for both person travel and freight. It identifies alternative future scenarios for 2030 and a concept of operations. The study determines the cost effectiveness of a large number of different actions that can enhance reliability and explores a novel method for imputing the economic value of improving travel time reliability.
This report will be useful for developing performance-based plans, long-range plans, and corridor plans.

The framework is consistent with MAP-21 planning requirements. The report emphasizes the role of technology and pricing, and is likely to stimulate future research on the economic valuation of reliability improvements.
The report is available at https://www.trb.org/Main/Blurbs/168142.aspx

Staff Responsibility: William Hyman

Travel time reliability is the variation of travel time for the same trip from day to day. When the variability is large, the travel time is unreliable; and, vice versa, when there is little to no variability, the travel time is reliable. Many technological changes, operational solutions, and organizational actions for improving travel time reliability exist now, and even more will become available in the next 20 years. These changes, solutions, and actions can provide more effective management of transportation demand, increases in person- and freight-moving capacity, and faster recovery of the capacity lost to various types of disruptions.

The objective of this project was to identify and evaluate strategies and tactics for satisfying the travel time reliability requirements of users of the roadway network those engaged in both freight and person transport in urban and rural areas. These strategies needed to serve the near and more distant future and incorporate current and innovative approaches, both low-tech and high-tech.

This project developed a set of recommendations regarding institutional actions and traffic operations treatments that will improve travel time reliability both now and in the future (by the year 2030).

Project Status: The project is complete.

Product Availability: Evaluating Alternative Operations Strategies to Improve Travel Time Reliability, SHRP 2 Report S2-L11-RR-1, was published in November 2013.  It is available as an Adobe PDF.  A printed version is available through the TRB bookstore.  An e-book version of this report is available for purchase at Google, iTunes, and Amazon.  A fact sheet and project brief are also available.
This page was last modified on March 19. 2014.

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