It pays having speed radars in France! Not for safety as has been determined by many studies, but for the cash strapped government. Last year, the combined issued fines brought in a whopping €1.398 BILLION, that's almost 1.5 Billion Euros (at today's rate, almost US$2 Billion).
€660 Million of that collected windfall goes to the local communities, in order to help them improve roads. €65 Million is used for processing the fines (administration costs), €52 Million to maintain the radars, €20 Million to fight the increasing vandalism (I wonder