Sir Francis Drake Boulevard

One of TAM’s major responsibilities as Marin County’s Congestion Management Agency (CMA), and prepare a congestion management program consisting of system monitoring to assess performance of the transportation system, and a travel demand forecasting tool or model, to assess potential impacts on the transportation network from changes to the roadway network and local land use decisions. TAM is responsible for the development, maintenance and application of a countywide travel demand model, consistent with regional land use and socio-economic database of the Association of Bay Area Governments, and assumptions of the Metropolitian Transportation Commission’s regional travel demand model.

What is a travel demand model?

Travel forecasting models serve as important long-range planning tools that help us predict what the travel demand will look like in the future. Models consider factors such as population, housing, the economy, transit options and more. Using a model provides us with quantifiable data for for transportation investments and decision-making.

TAM’s travel demand model

By state law, our model is required to be consistent with the regional model developed and maintained by the Metropolitan Transportation Commission (MTC) and with land use and demographic data published by the Association of Bay Area Governments (ABAG).

TAM’s current model, the MTM, is a traditional trip-based, four-step demand model, focused on Marin County. TAM is in the process of updating the MTM to a new Activity-Based Model, the Transportation Authority of Marin Demand Model (TAMDM). The TAMDM is currently in development, with development expected to be completed in 2017.