### Road Traffic (Construction and Maintenance of Vehicles) Regulations (words omitted as spent—E.R. 2 of 2012) 《道路交通(車輛構造及保養)規例》

55. Stability
(1) The stability of a double-decked bus shall be such that when loaded with weights placed in the correct relative positions to represent the driver and a full complement of passengers on the upper deck only, if the surface on which the vehicle stands were tilted to either side to an angle of 28 degrees from the horizontal, the point at which overturning occurs would not be passed.
(2) The stability of a single-decked bus and light bus shall be such that when loaded with weights placed in the correct relative positions to represent the driver and a full complement of passengers, if the surface on which the vehicle stands were tilted to either side to an angle of 35 degrees from the horizontal, the point at which overturning occurs would not be passed.
(3) For the purpose of conducting tests of stability the height of any stop used to prevent a wheel of the bus or light bus from slipping sideways shall not be greater than two thirds of the distance between the surface upon which the vehicle stands before it is tilted and that part of the rim of that wheel which is the nearest to such surface when the vehicle is loaded in accordance with the requirements of this regulation.
(4) For the purposes of this regulation, 57 kilograms shall be deemed to represent the weight of one person.

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.

57. Guard rails
(1) If any two wheels on the same side of a bus have a clear space of more than 600 millimetres between their nearest points, a guard rail, running board or other similar device, which shall extend to within 220 millimetres of the front wheel and 150 millimetres of the rear wheel, shall be fixed to guard such space effectively to within at least 250 millimetres of the ground when the vehicle is carrying no passengers and is standing on level ground.
(2) Any guard rail fitted in compliance with this regulation shall be so constructed and fitted that, when necessary, by raising the rail or otherwise, access can easily be obtained to any part of the space underneath the vehicle.

### Road Traffic (Construction and Maintenance of Vehicles) Regulations (words omitted as spent—E.R. 2 of 2012) 《道路交通(車輛構造及保養)規例》

58. Brake and steering connexions
(1) Where brake and steering connexions of a bus are secured with bolts or pins, the bolts or pins shall be threaded and effectively locked.
(2) The steering arm, steering rods and joints and all other moving parts of the steering mechanism of a bus shall be kept clean and free from rust.
(3)  The ball and socket joints of steering connexions when such are used in the steering mechanism of a bus shall not be pendant:
Provided that this paragraph shall not apply to spring loaded self-adjusting spherical joints. 
(4) Dust-excluding covers fitted to any joint or connexion of the steering mechanism of a bus shall be capable of being easily removed to facilitate inspection.

59. Hub projection
No portion of any wheel of a bus or any of its fittings shall project more than 90 millimetres beyond the extreme outer face of the tyre when fully inflated.

### Road Traffic (Construction and Maintenance of Vehicles) Regulations (words omitted as spent—E.R. 2 of 2012) 《道路交通(車輛構造及保養)規例》

60. Fuel tanks, carburettors, etc. on buses and light buses
(1) No fuel tank shall, in any single-decked bus, half-decked bus or lower deck of a double-decked bus, be placed under any part of any gangway or under any part of any passage leading to an emergency exit (not being a secondary emergency exit) if that part of the gangway or passage is within 600 millimetres of any entrance or exit.
(2) No fuel tank shall, in any light bus, be placed immediately under any entrance or exit or within 300 millimetres of any entrance or exit and no filling point for a fuel tank shall be situated at the rear of the vehicle.
(3) No part of any fuel tank or apparatus for the supply of fuel shall, in any bus or light bus, be placed in the compartments or other spaces provided for the accommodation of the driver or passengers.
(4) All fuel tanks and all apparatus supplying fuel to the engine shall, in every bus and light bus, be so placed or shielded that no fuel overflowing or leaking therefrom can fall or accumulate upon any woodwork forming part of the vehicle or upon any other part of the vehicle or fitting thereto such that it might readily be ignited or can fall into any receptacle where it might accumulate.
(5) The filling points for all fuel tanks shall, in every bus and light bus, be accessible only from the outside of the vehicle and filler caps shall be so designed and constructed that they cannot be dislodged by accidental operation and any vent hole shall be protected from danger of penetration by fire and shall be so designed as to prevent fuel from being splashed over.
(6) A device shall be provided in every bus and light bus by means of which the supply of fuel to any carburettor or, in the case of a fuel injection pump, to the injection nozzles, can be readily cut off and the following requirements shall be complied with in respect thereof—
(a) the means of operation shall at all times be readily accessible from outside the vehicle and, except in the case of a vehicle fitted with an engine having a fuel injection system, shall be readily visible from the outside of the vehicle; and
(b) in a case where the device is so visible, the “off” position of the means of operation thereof shall be clearly marked also on the outside of the vehicle, and in a case where the said device is not so visible, its position shall be clearly marked on the outside of the vehicle and the means of operation shall also be clearly indicated. (E.R. 4 of 2022)

### Road Traffic (Construction and Maintenance of Vehicles) Regulations (words omitted as spent—E.R. 2 of 2012) 《道路交通(車輛構造及保養)規例》

61. Exhaust pipes on buses and light buses
(1) The exhaust pipe of every bus and light bus shall be so fitted or shielded, and maintained that—
(a) no inflammable material can be thrown upon it from any other part of the vehicle;
(b) it is not likely to cause a fire through proximity to any inflammable material on the vehicle; and
(c) so far as is reasonably practicable, fumes are prevented from entering the vehicle from it.
(2) The outlet of the exhaust pipe of every bus and light bus shall be placed—
(a) on the off side of the vehicle; or
(b) at the rear of the vehicle, as near as is reasonably practicable to the off side of the vehicle.

62. Locking of nuts
All moving parts of a bus and light bus and all parts subject to severe vibration which are connected by bolts or studs and nuts shall be fastened by lock nuts or by nuts and efficient spring or locking washers or by castellated nuts and split pins or by some other efficient device to prevent their working or coming loose.

63. Artificial lighting
(1) In every bus—
(a) adequate internal lighting shall be provided for the illumination of— (L.N. 95 of 1993)
(i) each deck thereof having a permanent top;
(ii) any step or platform thereof forming part of any entrance or exit, other than an emergency exit;
(b) at least one lamp shall be provided as near as reasonably practicable to the top of every staircase leading to an upper deck thereof not having a permanent top; and
(c) all lighting circuits shall be so arranged that an electrical failure of any lighting sub-circuit shall not be capable of extinguishing all the lights on any deck thereof.
(2) Adequate internal lighting shall be provided in every light bus for the illumination of the light bus and any step or platform thereof forming part of any entrance or exit, other than an emergency exit, and all lighting circuits shall be so arranged that an electrical failure of any lighting sub-circuit shall not be capable of extinguishing all the lights therein.