Whatever the speed limit, drivers would be physically prevented from exceeding it. Yet there is another compelling reason to limit truck speeds. NHTSA has said the speed limiters should take care of the discrepancy between state speed limits and truck tire capabilities. Most of the states with speed limits of 80 or above either didn't know about the truck tire speed ratings or didn't consider them. States set their own speed limits, having been given sole authority to do so by Congress in the mid-1990s.

Source: Fox News August 26, 2016 16:18 UTC