1. An automatic vehicle path determination system for determining the path taken by a vehicle travelling through an area having structures that inhibit reception of position locating signals, said system comprising: a signature zone cell database including a plurality of signature zone cells corresponding to travel paths within a signature zone, said signature zone cell database also including a plurality of location coordinates, said plurality of location coordinates corresponding to locations within said plurality of signature zone cells; and a travel path matrix including a plurality of correlation values, said plurality of correlation values corresponding to said plurality of location coordinates such that the travel path of a vehicle can be determined by comparing values in said travel path matrix for ones of said plurality of location coordinates in said signature zone cell database corresponding to position information received from said vehicle.