Validation of Urban Freeway Models (2014) / Chapter Skim
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1Overview The goal of the SHRP 2 L33 Validation of Urban Freeways project is to assess and enhance the predictive travel time reliability models developed in the SHRP 2 L03 project, Analytical Procedures for Determining the Impacts of Reliability Mitigation Strategies. SHRP 2 L03, which concluded in 2010, developed two categories of reliability models to be used for the estimation or prediction of travel time reliability within planning, programming, and systems management contexts: data-rich and data-poor models.
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2for the data-rich and data-poor models in the Los Angeles, California; Minneapolis–Saint Paul, Minnesota; Sacramento, California; Salt Lake City, Utah; San Diego and San Francisco, California; and Spokane, Washington, metropolitan regions. The validation was performed by processing the collected data in accordance with L03-established methodologies and using it to compare the predicted reliability metrics with the measured ones.
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3 The data-poor enhancement process yielded the following findings: 1. In general, the recalibrated L03 models yielded reasonable error values (measured by the mean square error)
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