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part of the problem is that law enforcement here in the states never enforces the law equally. how often do you see a hummer pulled over? pickup truck? SUV in general? officers are insanely quick to target cars - especially ones that are somewhat customized like mine - wether they are breaking the law or not, while they let the hummer doing 90 whiz right by. honestly, our speed limits should be based on vehicle type much like the autobahn, where trucks are restricted to slower speeds than cars.

another option would be to take a page from the new nissan GTR - they have a built in database of japan (the JDM model has it) and a ECU-integrated GPS. if the GPS determines that the car is *not* on a nissan-approved track, the car is nerfed to a hard limit of 120mph or so. a more draconian measure would be to have a GPS database of all roads in a given country, and allow the GPS to govern the vehicle to the legal limit at all times.

only glitch to this is that it would never come to pass, as a system like this would effectively eliminate speeding tickets, and thus cost government a great deal of revenue.