This is the last part of the series on how to “zhng” (dialect for “modify” or “upgrade”) your car without breaking the law.

If you need advice or clarification on specific vehicle modifications, you can write in to the Vehicle Engineering Department of LTA or contact the Department at 1800-CALL LTA (1800-2255 582).

(Sport seats, bucket seats, etc.)

Aftermarket car seats must be properly secured using the original anchorage points of the vehicle, for safety reasons. The car seats must not obstruct the driver's view in any way.

Any modification to original airbag-equipped car seats must be carried out in consultation with the vehicle manufacturer or its agent.

1. No part of the sunshade shall be affixed more than six inches from the top edge of the front windscreen and more than four inches from the top of edge of the rear windscreen and side windows.



2. Graphics and words should not be pornographic, obscene or vulgar. They also must not be seditious or affront any religious beliefs.

1. Aftermarket suspension systems shouldn’t adversely affect the steering characteristics and manoeuvrability of the vehicle.



2. The lowest point of the vehicle body must not be in contact with the road surface at any time.



3. No part of the vehicle bodywork shall be modified to accommodate the suspension system.

1. Tinted films must not be of the reflective type.



2. Tinted glass must comply with internationally recognised standards for safety glass.



3. For both tinted films and glass, the resultant light transmittance for the front windscreen and two front passenger windows must be at least 70 per cent.



4. The resultant light transmittance for the rear windscreen and the rear passenger windows must be at least 25 per cent.



5. The front windscreen must not prevent, obstruct or interfere with the transmission of signals between the In-vehicle Unit (IU) and Electronic Road Pricing (ERP) facility.*

(*You can send your vehicle for testing at any of the LTA-authorised vehicle inspection centres to ensure that the tinted films or glass comply with the requirements.)

1. Every wheel must be fitted with a pneumatic tyre of the correct width, profile and diameter as recommended by the vehicle manufacturer.



2. The tyres must not protrude from the vehicle laterally.



3. The overall rolling radius of the original wheels and tyres shouldn’t be altered.



4. Off-road tyres are not allowed for use on normal roads.

(Note: All installations must be carried out by qualified personnel in accordance with the product manufacturer's recommendations.)