However ANPR technology is also used to time vehicles between two or more fixed cameras that are a known distance apart (typically at least several kilometres). The average speed is then calculated using the formula: formula_1. The longer distance over which the speed is measured prevents drivers from slowing down momentarily for a camera before speeding up again. The SAFE-T-CAM system uses this technology, but was designed to only targets heavy vehicles. Newer ANPR cameras in Victoria are able to target any vehicle.