What is the maximum allowable height for a vehicle without a special permit?

The maximum allowable height for a vehicle without a special permit is 4.15 metres. This height regulation is in place to ensure vehicles can safely navigate under bridges, overpasses, and other infrastructure without risk of collision or obstruction. Setting this standard helps maintain safety on the roads and ensures that vehicles can operate effectively without needing additional permits or modifications.

Choosing 4.15 metres aligns with established legal and safety requirements in many jurisdictions. This specification helps streamline traffic flow by reducing the number of vehicles that require special accommodations for height, thereby simplifying logistics for transport operators and ensuring compliance with municipal and state regulations.

The other height options exceed this standard and would generally necessitate a special permit process, indicating that they would typically be allowed only under specific circumstances or with extra oversight to ensure safety compliance.