Here are some laws, rules, and regulations guiding trucking and truck drivers in Ohio: Intrastate truck drivers must be at least 18 years old. Truck drivers are allowed to drive for 12 hours following eight consecutive hours off duty. All intrastate vehicles, including trucks, must have the company name, city, state, and company vehicle number displayed on both sides of the vehicle in contrasting letters. The maximum weight limit for single axle trucks in Ohio is 20,000 lbs. The maximum width of a commercial truck in Ohio is 8 feet, 6 inches, or 102 inches.