For those doing euro trips this year, watch out, the Gendarmerie are known for targeting British drivers and they're pretty hostile to boot.
We don't really go too much over the limit (keep around 90mph generally) any more but if you really want to risk it their favourite hiding places are exits from the toilet stops, I always slow down a bit and try and have a good look in there as passing. Keep to lower limits for sure like the 90 and 110 especially when raining (lower limit), look out for gendarmerie signs as they are near their base and in approaching toll booths (normally well signed in advance). There are several little hideaway laybys behind bridge abutments and over the brows of hills too they like to sit in.
We've fallen foul of this a few times and always carry a decent amount of cash with us just in case (they are not honest to your speed either) as the trip we had to make to the ATM one year thanks to Kerry's speeding cost us a couple of hours
http://www.bbc.co.uk/news/world-europe-23619783
Same really applies to Belgium and where they have limits on Autobahns too. You'll find many more on the road police with hairdryers all over Europe than over here.
