Singapore legislation
Regulation 61
of Road Traffic (Motor Vehicles, Construction and Use) Rules
Regulation 61
Guard rails
Subregulation 1
If any 2 wheels on either side of a vehicle have a clear space of more than 600 millimetres between the nearest points, that space shall be effectively guarded to within 230 millimetres of the front wheel and 150 millimetres of the rear wheel and to within 250 millimetres of the ground when the vehicle is carrying no passenger and is standing on level ground.
Subregulation 2
Any guard rail fitted in compliance with this rule 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.