![]() The latter model disaggregates FAF flows to US between all US counties that begin, end, or pass truck trips through San Diego County (the latter including truck trips that go into or originate in Mexico). ![]() ![]() Two different models are fitted, based on two different levels of geographic scale: one for local or internal to San Diego County truck trips, and one for longer distance, external to the region truck trips across the entire United States (see Figure 1). The truck model includes both trip –based generation and subsequent distribution models. Internal and External Truck Trip-Based Models.It follows the traditional and sequential trip generation-distribution-traffic assignment modeling framework, and offers a well-documented example of the data and modeling issues associated with doing so at a detailed level of spatial resolution and on a limited data collection budget. The SANDAG Truck Model is an aggregate flow model developed to make use of existing data sources.
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