Samenvatting
The author dicusses the three basic data series in the office of highway information management, fhwa. They include the highway performance monitoring system, the highway users and finance data, and the nationwide personal transportation study. Also discussed are thebureau of the census truck inventory and use survey and the nationwide truck activity and commodity survey. This paper appears in transportation research record no. 1271, Transportation data and information systems: current applications and needs 1990.