Rules of the Road

Vehicle Height and Width Limits

Measured with the load on

These limits apply to the vehicle together with any load on it. A van that clears a height limit empty can break it with a roof load, and that is the driver's responsibility, not the loader's.

Overall Height

VehicleMay not exceed
Double-deck bus4,65 metres
Any other motor vehicle4,3 metres

Overall Width

VehicleMay not exceed
A bus whose front wheel centres are more than 1,9 m apart2,6 metres
A goods vehicle of 12 000 kg GVM or more2,6 metres
Any other vehicle2,5 metres

Why these numbers exist

Height limits are set by what passes under bridges, power lines and tunnels — which is why height restriction signs appear before those structures, and why the sign's figure always wins over the general limit. Width limits are set by lane widths.

We also carry pages on overall length, on load projections and overhang, and on the height and width restriction signs you meet on the road.