The Ford Motor Company’s European division has developed a system that monitors changes in speed limits as you drive. When a driver activates the Intelligent Speed Limiter on his car, he chooses a maximum speed. When the car exceeds that limit, it alerts the driver.
It also scans the road for speed limit signs. When it determines that the car is going over the speed limit in a particular area, it alerts the driver and stops accelerating. It doesn’t apply the brakes—it just takes its virtual foot off the gas. A driver can override the limiter by pressing on the gas pedal.
-via Gizmodo
On the subject of driverless cars. When an accident is imminent and the choice for the car's brain is to swerve into the queue of children waiting to cross the road or to let you get wiped out by the huge truck that just barrelled through the intersection straight at you, what's it going to do? Don't say it can't happen - it will.
With the dip in revenue from speeding tickets and driver licenses, nasty little towns won't be able to afford cops. They'll become havens for warlords. I'll bet the warlords will disable the autonomy of their self-driving cars.