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Open Access Publications from the University of California

An Activity-Based Approach to Accessibility


This paper presents the initial formulation of an activity-based model structure to address deficiencies in traditional measures of individual accessibility and which incorporates temporal transference effects of alternative travel behaviors within a household to form an index sensitive to such effects. A network-based activity assignment protocol is developed for complex travel activity decisions within a household. The research incorporates routing, scheduling, household activity assignment and ride-sharing components into a hybrid model that explicitly captures the interactions between household members and integrates mode availability, ride-sharing behavior and time window constraints. In this approach, individual accessibility can be estimated and aggregated to reflect accessibility within a household under alternative transportation supply environments. Prior research on such accessibility approaches suggests that the proposed extensions can be applied to estimate the impacts of changes in transportation and land development policies; the usefulness of this approach in such analysis is demonstrated by its application to selected case studies based on data derived from the Portland, Oregon Activity and Travel Behavior Survey.

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