VEHICLE INTELLIGENCE & TRANSPORTATION ANALYSIS LABORATORY University of California, Santa Barbara

Forecasting Travel Demands of Demographic Groups—An Optimal Resource Allocation Tool

Preliminary findings: Workers and Accessibility Maps

Initial analysis focuses on four geographic areas: (a) Los Angeles-Orange County, (b) San Francisco Bay, (c) Santa Barbara County, (d) all California. Maps for Santa Barbara County are currently highly generalized because there are few census tracts in the area compared with Los Angeles and San Francisco. In a later phase of the project, Santa Barbara County will be studied in greater depth, at finer geographic resolution.

1. Numbers of workers in the following categories are mapped, based on data from the Census Transportation Planning Package (CTPP):

• Educational and Health Service Workers
• Manufacturing
• Public Administration
• Retail
• All Other

2. Travel time is estimated by analyzing stated travel time in the CTPP. The CTPP reports two travel times, peak and off-peak, from each census tract to every other. The faster of the two is assumed. For each origin census tract, the maps show the number of workers in each of the above occupation sectors that can be reached in 20, 40 and 60 minutes. This is a preliminary measure of accessibility to services in the various sectors, from each origin tract.

Further information

Kostas Goulias goulias@geog.ucsb.edu
Val Noronha noronha@ncgia.ucsb.edu