Evaluating Alternative Operations Strategies to Improve Travel Time ...

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SHRP 2 L11: Final Report • Decision support systems that help responders take the appropriate corrective actions; • Control systems that either increase the available functional capacity of roadways/corridors/networks or temporarily dampen travel demand within the affected area until the unreliable condition no longer exists; and • Support for implementing significant control systems or actions (e.g., closing roadways or ramps) for short periods in response to unusual traffic conditions. The current SHRP2 L03 (3) and SHRP2 L06 (4) projects focus on existing processes/techniques used by transportation agencies with respect to incorporating reliability, and were also used as input to this effort. Knowledge of Available Tools’ Effectiveness Since the resources necessary to massively overbuild the transportation system are and will continue to be lacking, improving travel-time reliability requires managing the transportation network at performance levels that are as close to optimum as possible. This management task cannot be accomplished without the ability to monitor the performance of the roadway system. This management task also includes an analysis function which can quantify the on-going effectiveness (in near real-time and as a result of detailed performance analysis) of each of the operational programs adopted to create a more-reliable transportation system. Thus, a key aspect of improving transportation network reliability is having the underlying management support systems that describe: • The status and performance of the transportation system; • The causes of unreliable travel times; • When and where these events/disruptions take place; • The size of the impacts these events/disruptions have on travel times; • The effectiveness of each action taken in response to these events/disruptions; and • Management support to continually improve operational performance. Reporting is a good way to be aware of the agency’s performance in terms of a comparison from year to year or between peers to help evaluate and improve an agency’s procedures. Including reliability measures and efficiency is a new trend. EFFECTIVENESS OF AGENCIES Page 17
SHRP 2 L11: Final Report REFERENCES (1) (2) (3) (4) Margiotta, R. Research Results Digest 312 Presenting the Results of NCHRP Project 3-68, Guide to Effective Performance Measurement. Transportation Research Board, National Cooperative Highway Research Program, Washington, D.C., 2007. URL: http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_rrd_312.pdf Accessed Sept. 23, 2008 Research and Innovative Technology Administration’s (RITA’s) ITS Deployment website. URL: www.itsdeployment.its.dot.gov Accessed Jan. 16, 2009. Margiotta, R. SHRP2-LO3: Analytic Procedures for Determining the Impacts of Reliability Mitigation Strategies. TRB, National Research Council, Washington, D.C., 2009. URL: http://trb.org/TRBNet/ProjectDisplay.asp Project ID=2179, Accessed Sept. 23, 2008. Lockwood, S. SHRP2-L06: Institutional Architectures to Advance Operational Strategies. TRB, National Research Council, Washington, D.C., 2009. URL: http://trb.org/TRBNet/ProjectDisplay.asp?ProjectID=2180 Accessed Sept. 23, 2008. EFFECTIVENESS OF AGENCIES Page 18
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