Final answer:
The maximum legal height of a vehicle on U.S. roads is typically 13 feet 6 inches to ensure safe passage under overhead structures.
Step-by-step explanation:
The legal maximum height of a vehicle on roadways in the United States is typically 13 feet 6 inches. It is crucial for all vehicles to comply with this regulation to ensure they can safely travel under bridges, overpasses, and other overhead structures without causing damage or accidents. This height limit is set to provide a standard for vehicle manufacturers and transport operators, ensuring the safety of infrastructure and road users.