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Mechanical emergencies while driving

SPF handbook guidance on vehicle checks and responses to roadside mechanical emergencies, plus statutory conditions and limits for towing vehicles and using trailers.

vehicle-emergency breakdown tyre brake-failure

主要来源： https://www.police.gov.sg/-/media/SPF/Knowledge-Hub/Traffic/FT-ENG-2126-Revised.pdf

Mechanical emergencies while driving

Checks that can help prevent a roadside failure

Before driving, the current SPF Final Theory of Driving handbook recommends checking for a punctured tyre, working lights, clean windscreens, fluid leaks under the vehicle and functioning dashboard warning lights and gauges. After starting, it advises moving off slowly and checking for unusual noises or vibration, brake operation and unusually heavy steering (SPF, Final Theory of Driving handbook, para. 294).

The handbook also recommends weekly checks of coolant, washer fluid, engine oil, battery connections and fluid, brake fluid and tyre pressure, and keeping a spare tyre and wheel-changing tools in the vehicle. It says periodic maintenance should follow the manufacturer’s recommended intervals (SPF, Final Theory of Driving handbook, paras. 295–296).

SPF’s Final Theory of Driving handbook groups roadside mechanical failures under emergency driving. For an unexpected breakdown, it says to retain control, alert other road users with the horn, headlights and hazard lights, and move to the side only after checking that it is safe (SPF, Final Theory of Driving handbook, para. 273).

Sudden visibility problems

If a loose bonnet lifts and obstructs the view ahead, the handbook advises slowing smoothly and progressively, then stopping by the side of the road to close it (SPF, Final Theory of Driving handbook, para. 274). If a windscreen shatters, it advises turning on hazard lights, slowing down and moving to the side of the road (SPF, Final Theory of Driving handbook, para. 275).

Fire or stuck accelerator

For a vehicle fire, SPF’s handbook advises stopping by the side of the road, getting all passengers out in an orderly manner, moving them as far from the vehicle as possible, and using a fire extinguisher. If no extinguisher is available or the fire cannot be put out, call 995 (SPF, Final Theory of Driving handbook, para. 277). LTA publishes additional fire procedures for expressways and tunnels in Expressway and tunnel rules.

For a suspected EV battery fire, members of the public should not try to extinguish it. Move at least 15 metres away and call 995; LTA says dry-powder extinguishers are less effective against battery fires. Possible warning signs include popping or hissing from the battery compartment, sparks, a sudden large volume of thick grey or white smoke, and jet-like flames (LTA and SCDF, Robust standards and public awareness key to safety; SCDF, 2026 Civil Defence Emergency Handbook).

If the accelerator is stuck, the handbook says to try to lift the pedal with the toe of a shoe without taking attention off the road. If it cannot be freed, switch on hazard lights, move safely to the side, stop, and switch off the ignition (SPF, Final Theory of Driving handbook, para. 278).

Engine or wheel problems

For engine overheating, the handbook advises switching on hazard lights, slowing and stopping safely at the side of the road, then waiting for the engine to cool. It specifically warns not to open the radiator cap while the engine is hot because steam can gush out and scald the person opening it (SPF, Final Theory of Driving handbook, para. 276).

For foot-brake failure, the handbook advises turning on hazard lights and moving safely to the side, applying the handbrake, and switching off the engine. Its gear-change instruction is to change down quickly, preferably to second gear, and release the clutch to use engine braking; the handbook does not describe a separate automatic-transmission procedure (SPF, Final Theory of Driving handbook, para. 279).

If a loose wheel causes the vehicle to wander, make noise or become difficult to steer, the handbook advises slowing down, signalling and stopping at a safe spot by the side of the road. For a tyre blow-out, it advises holding the steering wheel firmly, steering against the pull, braking gently and progressively, and stopping by the side of the road (SPF, Final Theory of Driving handbook, paras. 280–281).

A breakdown on an ordinary road

For a breakdown on a public road, SPF’s Basic Theory handbook says not to leave the broken-down or wrecked vehicle there. Push it into a breakdown bay or as close to the side of the road as possible, switch on the hazard warning lights even in daylight, and place a reflective warning triangle at least 20 metres behind the vehicle. Arrange for it to be towed away immediately so it does not obstruct traffic (SPF, Basic Theory of Driving handbook, para. 101). LTA’s current road-sign guidance says breakdown signs should be placed at least 20 metres behind a broken-down vehicle (LTA, Driving Rules and Information).

The Road Traffic Act defines a trailer as a vehicle drawn by a motor vehicle, so the towing requirements in rule 119 also apply when one motor vehicle draws a broken-down vehicle (Road Traffic Act 1961, s. 2). If the vehicle is drawn solely by a rope or chain, the distance between the nearest points of the two vehicles must not exceed 4.5 metres. If that distance exceeds 1.5 metres, the connection must be made clearly visible to other road users within a reasonable distance from either side of either vehicle (Singapore Statutes Online, Road Traffic (Motor Vehicles, Construction and Use) Rules, r. 119(1)–(3)).

If the towed vehicle has all its wheels on the ground, rule 119 requires a person with a valid driving licence for that vehicle to be in charge of it, and its brakes and steering must let that person control its speed and direction. If it is attached by a rigid tow bar, the disabled vehicle’s brakes need not work only where the towing vehicle’s brakes let its driver control the speed of both vehicles. A vehicle being drawn must display an “On Tow” notice at its rear, with letters 150 millimetres high (Singapore Statutes Online, Road Traffic (Motor Vehicles, Construction and Use) Rules, r. 119(4)–(6)).

LTA’s LTA.PROMPT FAQ says a self-driven wheeled vehicle without a valid registration number cannot be driven on public roads. It must be transported on a vehicle with valid registration, such as a low-bed trailer, or towed by a vehicle with valid registration. If an oversized vehicle movement (OVM) permit application is being made to tow an unregistered vehicle, LTA instructs applicants to enter the towing vehicle’s registration under “main prime mover” and “TOWED VEH” under “main trailer/cometto”; this application guidance does not say that every such tow requires an OVM permit (LTA.PROMPT, FAQ — Permit for Vehicle Movement).

There is a separate limit on the length of the towing vehicle: a motor vehicle longer than 7 metres generally must not draw a trailer. The exception for breakdown recovery applies only when the broken-down vehicle cannot be steered by its own steering gear; a breakdown alone does not meet that stated condition (Singapore Statutes Online, Road Traffic (Motor Vehicles, Construction and Use) Rules, r. 120).

The handbook’s expressway breakdown instructions are covered separately in Expressway and tunnel rules; follow the site-specific procedures and live directions there (SPF, Final Theory of Driving handbook, paras. 271–273).

Routine trailer use

Every vehicle and trailer must be registered with LTA and display its licence plates before it is driven on public roads (Road Traffic Act 1961, s. 3; LTA, Standard Registration). For self-registration, LTA’s process requires an application for a Vehicle Approval Code (VAC) through VITAS; after in-principle approval, the trailer must pass an inspection at an LTA-Authorised Inspection Centre before LTA issues the VAC. LTA states there is no VAC application fee for trailers. Vehicles registered through a motor dealer follow a separate registration process (LTA, Standard Registration).

LTA suspended the Vehicle Parking Certificate (VPC) requirement for all trailers, including container trailers, low loaders and flat-bed trailers, for a two-year trial from 6 February 2026 to 5 February 2028. During the trial, trailers do not need a VPC for registration, road-tax renewal or ownership transfer. The suspension does not remove parking restrictions: trailers cannot be parked in residential estates or on public roads where parking is not designated. This is a temporary trial; LTA says vehicle parking policy remains under review (LTA, Two-Year Trial to Suspend Vehicle Parking Certificate Requirement for Trailers).

For statutory purposes, a “driver” in relation to a trailer includes the driver of the vehicle drawing it, and “drive” is construed accordingly. This identifies the person treated as the trailer’s driver; it does not state a separate licence class for a towing combination (Road Traffic Act 1961, s. 2; SPF, Singapore Driving Licence).

LTA lists low trailers among vehicles generally excluded from expressways, including expressway tunnels. Its guidance says to apply for an LTA permit if an excluded vehicle needs expressway access because of route constraints or because no alternative route is available. LTA gives an approximate processing time of 14 working days and requires the approval letter and its conditions to be available in the vehicle. This restriction is for low trailers; it does not classify every trailer as a low trailer (LTA, Driving on Expressways & in Tunnels).

The speed schedule sets a maximum of 60 km/h for a passenger vehicle drawing a trailer with a seating capacity of no more than 8 passengers (excluding the driver). For goods vehicles drawing a trailer, the schedule sets 60 km/h when the combined unladen weight of drawing vehicle and trailer is 2,500 kg or less, and 50 km/h when it exceeds 2,500 kg. A goods vehicle's marked maximum speed under the registration rules applies when it is not drawing a trailer; when drawing one, apply the relevant schedule limit and any lower applicable restriction. These are the schedule limits for those listed classes; they do not establish a general towing speed for other vehicle categories (Singapore Statutes Online, Road Traffic (Regulation of Speed) Rules, Schedule; Road Traffic (Motor Vehicles, Registration and Licensing) Rules, rr. 43–44).

For a trailer used on a road, rule 52 generally limits its overall length to 4.6 metres. The rule excludes trailers for exceptional indivisible loads and broken-down vehicles being towed; the Registrar may permit a trailer longer than 4.6 metres but shorter than 6.7 metres, subject to conditions. Rule 6 also caps a motor vehicle drawing a trailer other than a semi-trailer at 14 metres overall (Singapore Statutes Online, Road Traffic (Motor Vehicles, Construction and Use) Rules, rr. 6 and 52).

A trailer weighing more than 100 kilograms unladen generally needs an efficient brake system that can brake at least half its wheels while being drawn, controlled by the drawing vehicle’s brake operation, and capable of being set to prevent at least two wheels from revolving when stationary. Rule 53 provides exceptions, including a trailer not exceeding one metric ton unladen if its brakes automatically apply on overrun, and a broken-down vehicle being towed (Singapore Statutes Online, Road Traffic (Motor Vehicles, Construction and Use) Rules, r. 53). An unattached trailer must also be prevented from rolling by applying its brake or using a chain on at least one wheel (Singapore Statutes Online, Road Traffic (Motor Vehicles, Construction and Use) Rules, r. 116).

Trailer lighting rules require a matched pair of rear indicators and stop lights, unless the corresponding indicators or stop lights on the drawing vehicle are fully visible from the rear. A vehicle constructed to be able to tow a trailer must also have a matched pair of side indicators (Singapore Statutes Online, Road Traffic (Motor Vehicles, Construction and Use) Rules, rr. 26 and 30). Every trailer must have a device that gives an audible and sufficient warning of reverse movement. Rule 24 applies this requirement to trailers registered on or after 1 July 1980 and, from 1 July 1981, to every trailer. From 1 July 1981, every prime mover must automatically activate the attached trailer’s warning device when reverse gear is selected. The warning device must not use multiple tones or produce an unduly harsh, shrill, loud, or alarming noise (Singapore Statutes Online, current Road Traffic (Motor Vehicles, Construction and Use) Rules, r. 24).

On roads, a motor vehicle other than a works vehicle or land tractor must not draw more than one trailer. A motorcycle must not draw a trailer, and public service vehicles must not draw trailers (Singapore Statutes Online, Road Traffic (Motor Vehicles, Construction and Use) Rules, rr. 121, 123–124 and 133). The Road Traffic Act also requires an additional attendant to be carried on a trailer when a motor vehicle other than a heavy or light locomotive draws it. The Road Traffic (Carriage of Persons in Goods Vehicles) Rules further say that no person may be carried in a trailer except bona fide attendants attending to it; the Act and Rules define the attendant headcount differently for locomotives and other motor vehicles, so the two provisions must be read together for a specific vehicle. A trailer must not be used to carry a passenger for gain (Road Traffic Act 1961, s. 77; Road Traffic (Carriage of Persons in Goods Vehicles) Rules 2010, r. 2).

If a vehicle exceeds LTA’s width, length or weight requirements, an oversized vehicle movement (OVM) permit is required. LTA’s published width thresholds are more than 3.0 metres generally and more than 2.6 metres on controlled roads; a load rear overhang above 1.8 metres or 40% of vehicle length, whichever is less, also meets its stated length threshold. Weight thresholds depend on vehicle type and can be checked using LTA’s validation tool. OVM applications are submitted through LTA.PROMPT at least 3 working days before travel. The permit does not waive other legal requirements (LTA.PROMPT, FAQ — Permit for Vehicle Movement).

The Act allows rules to vary the attendant requirement for classes of vehicles or trailers and excludes certain vehicles from its definition of “trailer”. The Carriage of Persons Rules prohibit other people from being carried in a trailer, while the Construction and Use Rules require all vehicles, trailers, passengers and loads to be used so that no danger is caused or likely. The current driving-licence class descriptions identify which motor vehicles each class covers but do not expressly describe trailer combinations. LTA’s registration rules require the trailer owner to provide its manufacturer-specified maximum laden weight, or other information requested by the Registrar, for the Registrar to determine that weight. LTA lists tow hooks among modifications that are not allowed because their hard, sharp surfaces may aggravate collision injuries. Its published guidance does not explain whether “tow hook” includes a trailer-coupling device, or give a towing-capacity rating. Do not treat this item-specific prohibition as settling whether a particular trailer hitch is allowed. The registration rules require the Registrar to determine and mark maximum laden weights for goods vehicles and trailers from manufacturer specifications or other information, but do not state the maximum trailer mass an ordinary drawing vehicle is approved to tow (LTA, Vehicle Technologies and Modifications; Road Traffic (Motor Vehicles, Registration and Licensing) Rules, rr. 43–44). The cited official rules and public guidance do not state a towing rating for an ordinary drawing vehicle. Confirm the drawing vehicle's approved towing capacity and licence eligibility for a proposed combination with LTA and Traffic Police (Road Traffic Act 1961, s. 77; Road Traffic (Carriage of Persons in Goods Vehicles) Rules 2010, r. 2; Road Traffic (Motor Vehicles, Construction and Use) Rules, r. 101; Singapore Statutes Online, Road Traffic (Motor Vehicles, Driving Licences) Rules, r. 19; SPF, Singapore Driving Licence; Singapore Statutes Online, Road Traffic (Motor Vehicles, Registration and Licensing) Rules, rr. 43–44).

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