Abstract
An accurate and reliable transportation network data base is a prerequisite of a successful service route design system. the focus of this research is the design and development of an interactive procedure for use in the reclassification and verification of the u.s. geological survey's 1:100, 000 digital line graph data for use in a system that automatically designs rural snow and ice control routes for the indiana department of transportation. details of the digital line graph data format and conversion routines are presented. this paper appears in transportation research record no. 1304, highway maintenance operations and research 1991.