vehicle towing a trailer is limited to a maximum open-road speed of 90km/h. School buses towing a trailer are limited to maximum open road speed of 80km/h. Drivers also need to obey any lower speed limits that apply on particular roads. What are the limits for projecting loads? Vehicles may carry loads that are higher, longer or wider than the vehicle itself, provided the load doesn't exceed the maximum permitted dimensions for that class and type of vehicle, and provided the vehicle can be moved safely when loaded. It's the operator's responsibility to ensure the load is properly secured to the vehicle so the vehicle remains stable at all times. Loads that overhang the outside of the body or deck of the vehicle by more than 1m to the front or rear, or more than 200mm to the left or right side, need to carry special warning devices attached to the overhanging end(s) of the load, see Factsheet 13 . During the hours of daylight , there must be either: a clean white, or fluorescent red, orange or yellow flag, at least 400mm long by 300mm wide, or During the hours of darkness , the flags or hazard panels must be replaced with lights attached to the load. Loads more than 1 metre wide and extending more than 1 metre from the rear of the vehicle must have one red lamp (facing toward the rear) on each side of load. Loads up to 1 metre wide and extending more than