Singapore legislation
Regulation 15
of Road Traffic (Motor Vehicles, Construction and Use) Rules
Regulation 15
Wheels and diameters thereof
Subregulation 1
Every motor vehicle and trailer shall be so constructed that the entire weight of the motor vehicle or trailer is transmitted to the road surface by circular wheels or by tracks if the motor vehicle or trailer is a track laying vehicle.
Subregulation 2
In the case of a track laying vehicle the parts of the track which come into contact with the road surface shall be flat and have a minimum width of 13 millimetres; and the total area of each track in contact with the road surface at any one time shall be at least 230 square centimetres in respect of each metric ton of the unladen weight of the track laying vehicle.
Subregulation 3
A track laying motor tractor shall not draw any trailer.
Subregulation 4
All wheels of a motor vehicle and trailer which are equipped with tyres other than pneumatic tyres shall have a rim diameter of at least 670 millimetres.
Subregulation 5
Nothing in paragraph (4) shall apply to a —
works vehicle not exceeding 1.5 metric tons in weight unladen;
motor vehicle or trailer designed for use and used by or on behalf of the Government solely in connection with street cleansing, road repairs, the collection or disposal of refuse or the contents of drains, gullies, latrines or cess-pools; and (c)mobile crane.