As already said, lots of fixed cameras were vandalised by the GJs. The new ones are state of the art.
The flics over here are heavily into speed traps. Again, they have come to the game late so are equipped with all the latest technology which can get you from over 2kms away. Lots of them are unmanned, usually in dark coloured people carriers parked at the side of the road or in laybys, but the latest kit can now be contained in much smaller cars, according to the French motoring mags.
Favourite phrase ... "pompe à flics", accompanied by the action of pulling down the handle of a slot machine. Kerching!
Aside from speeding, it's also very noticeable that they are upping their scrutiny of drink-driving, so watch out for their stops on the outside of rural villages and towns at going home time. Dunno about the cities.