Federal and state laws regulate the trucking industry, and typically the truck's weight determines the type of laws commercial truck drivers must follow.
This category can include delivery trucks, 18-wheelers, dump trucks, big rigs, refrigerated trucks, tractor trailers, box trucks, semi trucks, and oil and gas trucks.
The National Highway Traffic Safety Administration defines large trucks as "any medium or heavy truck, excluding buses and motorhomes, with a gross vehicle weight rating (GVWR) greater than 10,000 pounds."
According to the National Highway Traffic Safety Administration, "large trucks were more likely to be involved in fatal multiple-vehicle crashes as opposed to fatal single-vehicle crashes than were passenger vehicles." 3
Rain, snow, or shine, it's not uncommon to see a commercial truck hauling down a Montana highway in any season. But the high-speed limits of Montana highway combined with the state's famously unpredictable weather means that driving across Montana in a large truck means driving in the most precarious conditions.