Patent Document ID: 4630109
Application ID: 06706952
Patent Status: 1

Claim One:
1. A vehicle tracking system for determining the lateral position of a vehicle relative to a desired roadway path including substantially parallel thereto an optically distinct feature comprising, in combination: scanning means functionally attached to said vehicle for optically scanning, at a known rate, a path having a component transverse the intended direction of travel of said vehicle at time spaced intervals as said vehicle travels along said roadway, said scan means producing a signal corresponding to the reflection of the scanned path; means concurrently storing said signals resulting from said time spaced scans including the signal portion corresponding to said optically distinct feature; and means responsive to said stored signals from successive scans for producing signals indicative of the time deviation of said signal portion resulting from successive scans for thereby determining the amount of lateral displacement of said vehicle relative to said optically distinct feature.