The Truvelo is a popular type of speed camera across Europe. Truvelo, a front-facing camera, is designed to capture photos of the front of a passing vehicle, including the driver. It uses infrared flashes triggered by inductive loops in the road surface to measure the vehicle's speed.
Truvelo doesn't produce a visible "flash" for oncoming drivers, so it can be difficult to figure out whether or not you've been caught speeding, so buying a speed camera detector could prove essential.
Truvelo speed cameras are gaining popularity across Europe as recent cases of registered drivers contesting fines for not driving the vehicle at the time are increasing, and in countries such as Switzerland, Germany and Scandinavia where photographic detection is being used is a necessary factor for law enforcement.