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Non motorized modes such as walking and biking have played an increasing role in daily travel in major metropolitan areas, accounting for 9% and 4% respectively of work tours by San Francisco residents in 2000 (Bay Area Travel Survey 2000). Because of their relatively low costs, emissions, and high potential public health and welfare benefits, most public agencies, including the San Francisco County Transportation Authority (SFCTA) are actively seeking ways to promote even more nonmotorized mode choice. Accordingly, attention to non-motorized modes within the regional travel demand models has increased. It is now standard practice in many urban areas to include walking and biking within mode choice models. However, due to lack of data, little is known about the routes and actual infrastructure that are used. There are two main benefits to adding a non-motorized mode route choice model to a regional …