Patent ID: 8275490

Claim:
A system for determining instances when a vehicle's indicated speed exceeds a governing speed, comprising: a receiver to receive information from which a vehicle's location envelope, indicated direction of travel, and indicated speed can be derived; a processor configured to: ascertain a location envelope in which the vehicle is located, an indicated speed of the vehicle, and a direction of travel of the vehicle at a sample time; select the governing speed for the vehicle at the sample time, comprising: ascertain possible road segments comprising at least a portion within the location envelope, eliminate road segments comprising a road segment direction of travel inconsistent with the indicated direction of travel, select as the governing speed a speed associated with a remaining road segment; and determine if the indicated speed exceeds the governing speed, wherein an altitude envelope of the vehicle can be derived from the information, and wherein the processor ascertains an indicated vehicle altitude envelope, and wherein select a governing speed further comprises eliminating road segments comprising elevations inconsistent with the altitude envelope of the vehicle.