>Also, speed limits in some states can't be enforced from 0 to 5mph over the limit. In my country that's also true (with marigin larger than 5mph), but my unde

>Also, speed limits in some states can't be enforced from 0 to 5mph over the limit. In my country that's also true (with marigin larger than 5mph), but my understanding is that that's because the measurements instruments (laser-based speed meters) are not perfect and it may be a mistake and not actual speed limit breach. Some methods of measuring car speed don't have this limitation, like range-based measurements (check time when car enters road segment, when it leaves road segment, and make sure the average is under the speed limit).