It?s also worth noting that Police measurement of your speed has to give you certain measuring tolerance by law in germany. Depending on the method used (and other boring factors), it?s between 3 and 10%. On the Autobahn with a Limit of 100 km/h, you?re pretty "safe" driving 110 km/h because of that. Also it doesn?t really "pay off" to get you for violations under 10km/h over wich is why on top of the tolerance, you also get a sort of "too much work for too little income" area in wich you are likley not to be botherd because of profit-reasons. Wich is why nobody really sticks to the limits shown on signs ... they always add 10% and still feel safe (and they can be) ... just untill the moment they cross the border into other european countries where they don?t have to give you such tolerances. Get caught doing 51 in a 50 km/h zone in the Netherlands (for example) , and you will be fined ...