What is the required clearance over a road?

The required clearance over a road is established to ensure that vehicles, particularly larger trucks, can safely pass under structures without the risk of collision. A clearance of 15 feet is commonly mandated to accommodate the height of most commercial vehicles including large trucks and busses, which often exceed the standard height of passenger vehicles. This clearance helps to promote safety on roadways near or adjacent to airport infrastructure, allowing for smooth traffic flow and minimizing potential obstacles that could lead to accidents.

Structures must also comply with local, state, and federal regulations, which often dictate this minimum height requirement to protect against both vehicular damage and the safety of the driving public. Hence, a 15-foot clearance is widely recognized as a standard that balances safety and practicality for roadway users.