I got flashed near Troyes by the crew of an unmarked radar car at midnight last year but fortunately wasn't stopped after it. They were positioned only a couple of hundred yards after a fixed camera position. The only time I have been pulled up for speeding in France was for approaching the tolls too fast when entering Nice. 2 police officers hiding behind the toll booth leapt out with a radar gun at the last minute but they were very reasonable and let me off with a warning. It certainly has made me a lot more cautious when approaching the peage now. As far as I know the police did try to use your time between the tolls to prosecute you for speeding some years ago but several court cases decided that asking the toll companies to declare your times to the police was an infringement on your civil liberties and it had to be abandoned.
I have to agree with the use of the telepeage transponder, it saves a huge amount of time in the summer when the tolls are at their busiest and even in the quiter times are worth their weight in gold for the amount of hassle they save.
Are you sure on the point of the GPS camera/black spot detectors? Sat nav systems have camera warnings built in and I saw a camera detector for sale in a BMW dealership in Toulon last week which it surely wouldn't have been if they are illegal. Mine is hard wired to the car and never got a second glance when I was stopped.
I have to agree with the use of the telepeage transponder, it saves a huge amount of time in the summer when the tolls are at their busiest and even in the quiter times are worth their weight in gold for the amount of hassle they save.
Are you sure on the point of the GPS camera/black spot detectors? Sat nav systems have camera warnings built in and I saw a camera detector for sale in a BMW dealership in Toulon last week which it surely wouldn't have been if they are illegal. Mine is hard wired to the car and never got a second glance when I was stopped.