When you drive a larger vehicle, you must know the vehicle’s height and width, and watch for and obey clearance signs on bridges and underpasses. The maximum height for a vehicle in Ontario is 4.15 metres. You must also remember that road repairs, rough roads, ice and floods may cause difficulty where clearance is otherwise normally adequate.

You must follow instructions on signs posted where dangerous conditions exist and obey regulations that ban trucks on certain highways, at certain times or on certain days.