San Diego Association of Governments On-Call Modeling Consultant

San Diego Association of Governments (SANDAG)

Since 2012, RSG has served as an on-call contractor for task orders to enhance the San Diego Association of Government (SANDAG)’s current activity-based model. These task work orders have included model calibration updates, implementation of Strategic Highway Research Program (SHRP2) C04 recommendations on pricing and reliability, improving the model sensitivities for active transportation modes, and improving modeling of special generators.

In 2019, SANDAG sought help updating their travel demand model to use new data to reflect current transportation behavior. We collaborated with them to calibrate their model using travel survey data (rMove) and validated the activity-based and disaggregate commercial vehicle model against traffic counts. As a result, SANDAG’s models now include several enhancements that account for micromobility, mobility-as-a-service (MaaS), and autonomous vehicles.

In addition, we developed an innovative benefit-cost analysis (BCA) tool to support the alternatives analysis performed as part of SANDAG’s San Diego Forward regional plan update. Still in use, the BCA tool incorporates several sources of benefits/costs and leverages the detailed information produced by SANDAG’s activity-based travel demand model system. The BCA tool is groundbreaking in that it also provides SANDAG with key insights into which regional travelers receive the benefits or bear the burdens of regional plan investments and policies, which is important to ensure equity.

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