I'm with Swanson. I can spend half a day driving around on a 15 acre parcel between 10 different projects. Hauling tools, material and crew. Never exceeding 5 mph on private roads sometimes paved, mostly not. Yeah it might only be a 2 min. drive - but multiple that time 30 or 50 times in a day... Don't jump to the conclusion all trucks are on public roads all the time driving 25 to 75 mph. I don't have an answer to the OP, but I sure appreciate learning one.