A system of computer hardware, software and data for collecting, storing, analyzing and disseminating information about areas of the earth. For land transportation purposes, GIS is defined as a highway network (special data which graphically represents the geometry of the highways, i.e., an electronic map) and its geographically referenced component attributes (road and bridge data, socioeconomic data, etc.) that are integrated through GIS technology to perform analyses. From this, GIS can display attributes and analyze results electronically in a map form.