1. A method of operating a motor vehicle, comprising the steps of: receiving intersection information; retrieving a predetermined distance; determining a set of potential intersections from the intersection information, the set of potential intersections including all the intersections that are less than the predetermined distance in front of the motor vehicle; selecting an identified intersection from the set of potential intersections; determining a threat level according to the identified intersection; and controlling a collision warning system of the motor vehicle according to the threat level.