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Why you should be careful
It all comes to where the car is registered. If you drive a french registered car, yours, a friend's, a lender's, the owner will receive a fine, and probably get back to you.
Still not concerned? Not so sure. As of now, only two country (Luxembourg and Switzerland) have agreed to share their car registration database with France. But as European police forces cooperate more and more, new countries are likely to join forces in that field. Besides, if arrested for routine checks by the police or gendarmerie, previous recorded infractions might turn up on the officers' computer. What's more, overspeeding by more than 50km/h is considered a big deal, and will bring you trouble anyway.
The program has already proven its effectiveness: average speed on french roads and highways is dropping. For a more comfortable driving experience in France, and to avoid being caught overspeeding in areas where the speed limit is not necessarily relevant, we strongly advise you to check out the location of automatic radars before you set wheels on french roads...