Camera Icon Supplied Credit: CarExpertWhile geofenced speed limiting remains rare in privately owned passenger vehicles, the underlying technology is already available in many modern cars. Camera Icon Supplied Credit: CarExpertIn most cases, the system wouldn't necessarily apply the brakes. Although mandatory geofenced speed limiting isn't currently used on public roads for private vehicles, many automakers already use geofencing for other purposes. Camera Icon Supplied Credit: CarExpertOutside passenger vehicles, geofencing is already commonplace. For now, compulsory geofenced speed limits remain a policy discussion.