French authorities are warning drivers in neighbouring France that there’s a crack down on speeding.
126 unmarked cars, operated by a private company, will be patrolling areas bordering Geneva and Vaud.
The cars they use are equipped with an infra-red flash – which means it’s invisible, the first you may know about being caught is when the fine arrives in the post.
But as the vehicles are not operated by the police – the margin of error is more generous.
That means to be caught out, you’ll have to driving at more than 146 kph on the autoroute, 124 on an expressway – where the limit is 110 - and 64 in a 50 zone.
Authorities say the idea of using private contractors means the police can concentrate on more serious offences, such as driving under the influence.
Having a Swiss plate won’t stop you from being fined.