 Ford's New Tech Will FORCE Cars To Slow Down 
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"Ford calls the tech Geofencing Limit Control. It relies on a few systems to function properly, at least in these early development stages. There is a bit of a prerequisite: this tech relies on driver-assist technology like automatic braking, and of course, adaptive cruise control to do its work."

"It'll also need GPS, as the first part of the name implies. Geofencing tells the car when it's in a restricted area, like a school zone, and slows the vehicle to an appropriate speed. Geofencing tech has a number of applications, and now we can add this to the list. That means that rather than reading a traffic sign (like many of Ford's vehicles can do), it relies on the positioning received from the car's GPS to decide when your need for speed has been satiated."