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SHRP 2 L11: Evaluating Alternative Operations Strategies to Improve Travel Time Reliability

KAI was the prime contractor for the project SHRP2 L11: Evaluating Alternative Operations Strategies to Improve Travel Time Reliability. This project identified and evaluated strategies and tactics to satisfy the travel time reliability requirements of users of the roadway network – those engaged in both freight and person transport in urban and rural areas. The project was intended to provide a short-term perspective regarding system operations and travel time reliability and to produce a long-term view with innovative ideas that can be implemented in the future. The project produced the following:

  • A profile of current and future highway users describing their individual and collective need for travel time reliability

  • An assessment of the effectiveness of transportation agencies in meeting the reliability needs of current and future highway users

  • Goals and desired performance targets for travel time reliability

  • A method for estimating the value of travel time

  • External trends likely to affect travel time reliability and its importance over the next twenty years

Three alternative scenarios for 2030 were developed, including an assessment of their impact on travel time reliability as well as its importance to users and operators. The research also evaluated a series of strategies and treatments for affecting travel time reliability. This evaluation included an assessment of the impact of each operational treatment on reducing travel time, addressing non-recurring congestion, and improving safety. Implementation costs for each treatment were reported based on user experience. The effectiveness and costs for each treatment were then used to develop benefit – cost guidance for improving operations. The project also developed a concept of operations to address the present and three alternative future sets of travel conditions. Each Concept of Operations serves as a prototypical proof of concept that also has functional applicability to the needs of many everyday practitioners.