Speeding tickets could eventually become a thing of the past, although perhaps not for the reason drivers would hope. Instead of relying on police, roadside cameras, or a driver's self-control, future cars could simply refuse to exceed the posted limit. The technology required to make that happen isn't particularly futuristic. Many modern vehicles already have GPS, cameras, digital maps, electronic throttle control, and increasingly sophisticated software capable of changing how a car behaves depending on its location. Geofencing could tie those systems together, creating virtual zones where a vehicle's maximum speed is automatically restricted. Drive past a school, enter a residential neighborhood, or move through a pedestrian-heavy city center, and the car could electronically prevent you from accelerating beyond the local limit. For now, compulsory geofenced speed limiting remains largely theoretical for privately owned passenger vehicles. The bigger obstacle may ultimately be political and public acceptance rather than whether automakers can actually build it. Your Car May Already Have Most Of The Technology Geofencing uses location data to determine when a vehicle has entered or left a predefined geographical area. Once inside that boundary, onboard software can automatically change certain vehicle settings. Applied to speeding, the concept is relatively straightforward. GPS and map data could identify the applicable speed limit, while cameras could provide additional information from roadside signs and electronic throttle control could prevent the engine or motors from delivering enough power to exceed it. Such a system wouldn't necessarily slam on the brakes whenever the speed limit changed. Instead, it could progressively restrict acceleration until the vehicle settled at the permitted speed, similar in principle to a conventional speed limiter. That could allow authorities to create highly specific restrictions. A school zone, for example, might automatically enforce a 30 km/h limit during certain hours before allowing higher speeds