Answering questions regarding the safest speed for commercial trucks to travel on highways involves more than simply knowing the posted speed limit. Speed limits are designed for the best of weather, road, and visibility conditions. The law stipulates that vehicles should travel at a speed that is reasonably safe for the conditions, even if that speed is less than the posted limit.
And tractor-trailer drivers need to account for all relevant conditions even more than most vehicles’ drivers. Large commercial trucks are roughly 20 – 30 times the size of passenger vehicles by weight, and are prone to a slew of dangers smaller cars don’t need to worry about. Accidents too often occur when large trucks travel too fast for the conditions. For passenger vehicle drivers who share the road with 18-wheelers, it’s important to know what to do in case of a truck accident. Truck drivers, for their part, need to be aware of all the legal speed limits in the states they travel, and—even more importantly—when to slow down.