### 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》

18A. Hydraulic braking systems
(1) A motor vehicle which is manufactured on or after 1 January 1990 and first registered on or after 1 July 1990 and which is equipped with a hydraulic braking system shall be provided with a warning device so placed as to be readily visible or audible to the driver of the vehicle when in the driving seat in order to indicate any impending failure in the hydraulic braking system due to fluid loss.
(2) The warning device referred to in paragraph (1) shall be so designed and constructed that—
(a) for a motor vehicle equipped with a split braking system, it will detect the differential in fluid pressure, or a drop in fluid level; and
(b) for a motor vehicle equipped with a non-split braking system, it will detect a loss in the applied fluid pressure, or a drop in fluid level.
(3) The Commissioner may, if he thinks fit, approve in writing the fitting in a hydraulic braking system of a warning device of a design and construction other than that described in paragraph (2) as sufficient compliance with paragraph (1).

19. Braking efficiency
(1) Subject to paragraph (2), every braking system of every motor vehicle shall—
(a) have brakes acting on all the wheels of the vehicle which as applied by one means of operation have a total braking efficiency of not less than 50 per cent;
(b) subject to subparagraph (c), have brakes which as applied by a second independent means of operation have a total braking efficiency of not less than 25 per cent; and
(c) in the case of a motor vehicle equipped with a split braking system to which regulation 16(8) applies, have brakes which in the event of a failure of any part (other than a fixed member or a brake shoe anchor pin) of one of the independent sections comprised in the split braking system are such that there remain brakes applied by the other section sufficient to have a total braking efficiency of not less than 25 per cent.
(2) This regulation shall not apply to engineering plant, an industrial tractor, land locomotive, land tractor, motor cycle, motor tricycle, invalid carriage, pedestrian controlled vehicle and straddle carrier.

### 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》

20. Wheels and tracks
(1) Every motor vehicle and every trailer shall be so constructed that the entire weight of the vehicle and of any trailer attached thereto is transmitted to the road surface by wheels or by tracks, or by a combination of wheels and tracks.
(2) In the case of a track laying vehicle—
(a) the parts of the track which come into contact with the road surface shall be flat and have a minimum width of 15 millimetres; and
(b) the total area of each track actually in contact with the road surface at any one time shall not be less than 230 square centimetres in respect of each tonne of the gross vehicle weight of the vehicle.
(3) Subject to paragraphs (6) and (7), every wheel of a motor vehicle, other than a road roller, and every wheel on a trailer when the trailer is being towed on a road, other than a trailer used solely on road repair work, shall be equipped with pneumatic tyres of suitable size and design.
(4) Subject to paragraph (8), all wheels of a motor vehicle or trailer which are equipped with tyres, other than pneumatic tyres, shall have a rim diameter of not less than 700 millimetres.
(5) Every wheel of a vehicle shall be truly circular, accurately centred on its axle and fitted to work thereon without oscillation or side play.
(6) The Commissioner by permit in writing, subject to such terms and conditions and for such period as appears to him fit, may authorize the use of a motor vehicle which does not comply with paragraph (3).
(7) Paragraph (3) shall not apply to—
(a) a motor tractor; and
(b) a motor vehicle designed for use in works or on private premises and used on a road only in passing from one part of the works or premises to another or to works or premises in the immediate neighbourhood,

if such vehicle is equipped with tyres on every wheel of soft or elastic material of a design and type approved by the Commissioner.
(8) Paragraph (4) shall not apply to—
(a) any motor vehicle or trailer not exceeding 1.5 tonnes unladen weight designed for use in works or on private premises and used on a road only in passing from one part of the works or premises to another or to works or premises in the immediate neighbourhood; and
(b) any mobile crane.

### 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》

21. Tyre of soft or elastic material
A tyre shall not be deemed to be of soft or elastic material unless the said material is either—
(a) continuous round the circumference of the wheel; or
(b) fitted in sections so that so far as reasonably practicable no space is left between the ends thereof,
and is of such thickness and design as to minimize, so far as reasonably possible, vibration when the vehicle is in motion, and so constructed as to be free from any defect which might in any way cause damage to the surface of a road.

### 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》

23. Steering
The steering mechanism of a vehicle shall be so constructed or arranged that no overlock shall be possible and that the wheels shall not in any circumstances foul any part of the vehicle.

24. Speedometer
(1) Every motor vehicle, other than a motor vehicle which it is at all times unlawful to drive at a speed exceeding 20 kilometres per hour and an invalid carriage, shall be fitted with an approved speedometer.
(2) An approved speedometer which is fitted as required by paragraph (1) shall be—
(a) maintained in good working order; and
(b) kept free from any obstruction which might prevent it from being easily read by the driver.
(3) For the purposes of this regulation, approved speedometer (認可速度錶) means—
(a) in the case of a motor vehicle which is registered before 1 May 2008, a speedometer which conforms with the installation and performance requirements for speedometers set out in Part 1 or 2 of Schedule 16;
(b) in the case of a new motor vehicle which is registered on or after 1 May 2008, a speedometer which—
(i) conforms with the installation and performance requirements for speedometers set out in Part 2 of Schedule 16;
(ii) has been examined to the satisfaction of the Commissioner; and
(iii) either—
(A) bears an approval mark recognized or assigned by the Commissioner; or
(B) is fitted to a vehicle bearing an approval mark recognized or assigned by the Commissioner in respect of the speedometer.

(4) No alteration in respect of design, accuracy or position shall be made to an approved speedometer fitted as required by paragraph (1), except as permitted in writing by the Commissioner.
(5) For the purposes of paragraph (3)(b)(ii), the Commissioner shall signify his satisfaction in writing.
(6) It shall be a defence in any proceedings in respect of a contravention of paragraph (2)(a) to prove that—
(a) the defect occurred in the course of the journey during which the contravention was detected; or
(b) at the time when the contravention was detected steps had already been taken to have the defect remedied with all reasonable expedition.
(L.N. 151 of 2007)