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Figure ES.2. Sensor coverage in the Southern California pilot site. Source: Caltrans Freeway Performance Measurement System (PeMS). pems.dot.ca.gov. Research Approach The Southern California pilot site conducted its SHRP 2 reliability product testing by leveraging existing CSMPs. These system management plans describe how each freeway corridor is currently performing, identify operational strategies and carefully chosen system expansion opportunities to improve performance, and quantify the likely benefits that result from these investments. In addition, each Southern California facility has a microsimulation model that can quantify the mobility benefits of various operational and system management strategies. Southern California has roughly a dozen corridors with completed CSMPs, which could be leveraged for further analysis and implementation of SHRP 2 products. The Southern California pilot site updated the analysis of the CSMPs for two freeways to examine the impacts of including travel time reliability. The study team followed these general steps for the pilot testing: ⢠Review facilities with existing CSMPs and select two of the most promising facilities for reliability improvement; ⢠Compare reliability on the facilities and understand factors that affect reliability; ⢠Use SHRP 2 tools to develop more detailed, robust analyses of travel time reliability; ⢠Leverage available microsimulation models, travel demand models, and automatic sensor data; Los Angeles I-210 Orange I-5 4
