The short answer A loaded tractor-trailer can roll over at speeds well below the posted limit, and frequently does. The driver may never have exceeded the sign. The reason is

The short answer Federal law caps a commercial driver at 11 hours of driving inside a 14 hour window, after 10 consecutive hours off duty, with a 30 minute break

The short answer The answer is on the side of the truck, and the file behind it is public. Federal regulations require most commercial vehicles to display the operating company’s