1. A computer-implemented method for determining the speed of a motor vehicle in a vehicle speed detection system, the method comprising: receiving a plurality of images of a motor vehicle traveling on a road, each of the images being separated in time by a known interval; determining, for each of at least two of the images, a position of a license plate, a light fixture on the vehicle, or both the license plate and the light fixture on the vehicle; determining, for each of at least two of the images, a point of contact where a same tire of the vehicle contacts a surface of the road based, in part, on one or more identified features of the vehicle in one or more of the plurality of images based on the position of the license plate, the light fixture on the vehicle, or both the license plate and the light fixture on the vehicle that was determined; and using the points of contact and the time interval separations to calculate a speed at which the vehicle is traveling on the road.