Hong Kong Regulations

ROAD TRAFFIC (CONSTRUCTION AND MAINTENANCE OF VEHICLES) REGULATIONS - REGULATION 56

Side overhang

No part of a bus or light bus, other than a direction indicator or a driving
mirror, shall project laterally beyond the outer face of the outer tyre of the
rearmost wheel on the same side of the vehicle as the projection in the case
of-

   (a)  a bus, by more than 150 millimetres; and

   (b)  a light bus, by more than 180 millimetres.