Overtaking and lane discipline in Singapore

Keep left and use of lanes

When driving along, the Highway Code says not to hog the middle of the road. Keep well to the left and as near as practicable to the road edge, including on dual carriageways, unless intending to overtake, intending to turn right, or where a bicycle lane calls for using the left-most vehicle lane. Keep in the left-most vehicle lane at any time when a full-day bicycle lane is present, and during a part-day bicycle lane’s operating hours (Singapore Statutes Online, current Highway Code, para. 50).

Where there is a full-day bicycle lane, keep to the left-most vehicle lane at any time; where there is a part-day bicycle lane, keep to the left-most vehicle lane during its operating hours. Do not drive, stop or park a motor vehicle on a full-day bicycle lane at any time or on a part-day bicycle lane during its operating hours (Singapore Statutes Online, Highway Code, para. 49A; paras. 49A and 50, current text search).

On a three-lane carriageway, the Code says a driver may use the central lane when slower vehicles occupy the left lane. It says the outer (right-hand) lane is for overtaking only and drivers should not remain there longer than necessary after overtaking vehicles in the centre lane (Singapore Statutes Online, Highway Code, para. 59).

Road-hogging and the legal rule

The Road Traffic Rules require a slow-moving vehicle to be driven as close as possible to the left-hand side of the roadway, and require every vehicle to be driven so it does not obstruct faster-moving vehicles (Singapore Statutes Online, current Road Traffic Rules, r. 5). The current DIPS Schedule classifies “obstructing flow of traffic” under Rule 5 as a 4-point offence (Singapore Statutes Online, current Driver Improvement Points System Rules, Schedule, item 17). SPF lists composition amounts of $150 for light vehicles and $200 for heavy vehicles for this offence (SPF, Penalties for Traffic Offences).

The Highway Code gives a separate recommendation for drivers of large vehicles: keep to the lower of the road speed limit and the vehicle speed limit, and travel in the extreme left lane, except for bus lanes during their operating hours, so faster traffic can overtake on the right. This is Highway Code guidance; paragraph 101 does not state a vehicle-size threshold for “large vehicles” (Singapore Statutes Online, Highway Code, para. 101).

The Code says never overtake unless it can be done without danger to yourself or others, and calls for special care at night, in heavy rain, or in mist. Return to the appropriate lane as soon as practicable and do not cut sharply in front of the vehicle passed (Singapore Statutes Online, Highway Code, paras. 60 and 62). When another driver is overtaking you, do not increase your speed to prevent them passing (Singapore Statutes Online, Highway Code, para. 65).

Do not overtake at or when approaching a pedestrian crossing, road junction, corner or bend, brow of a hill, or double white line. The Code also says not to overtake where the road narrows, where doing so would force another vehicle to swerve or reduce speed, or if in doubt (Singapore Statutes Online, Highway Code, paras. 63 and 64; para. 64).

The Code gives three cases where the usual right-side overtaking rule does not apply: passing on the left when the vehicle ahead has signalled a right turn; filtering left before a junction; and moving faster than vehicles to the right in slow-moving congested traffic (Singapore Statutes Online, Highway Code, para. 61).

Centre lines and limited visibility

Do not cross the centre line at a bend, near the crest of a rise, or anywhere the road ahead cannot be seen clearly. The Code also says not to cross a single continuous or broken white line along the middle of the road unless the road ahead is clear (Singapore Statutes Online, Highway Code, paras. 51 and 54).

Where continuous double white lines separate traffic flowing in opposite directions, do not overtake at those lines unless you stay entirely to their left. Never cross double white lines; U-turns and right turns are also prohibited on a road where they are painted (Singapore Statutes Online, Highway Code, paras. 52–53).

Lane discipline

Follow the arrows or words marked in a lane. Do not change lanes so suddenly that you inconvenience or endanger other traffic; signal early and plan your route. In traffic hold-ups, do not jump the queue, and choose the appropriate lane well before reaching a junction. On a two-lane carriageway, keep to the left-hand lane except when overtaking (Singapore Statutes Online, Highway Code, paras. 55–58).

Before changing lanes, the Highway Code advises checking the mirror, making sure the move is safe, and giving a clear signal. A signal does not itself give priority: Road Traffic Rules require enough warning for other traffic to take action to avoid danger, and the Highway Code says not to change lanes suddenly in a way that inconveniences or endangers traffic (Singapore Statutes Online, Highway Code, paras. 87–89; Road Traffic Rules, r. 2).

SPF’s driver safety guidance adds two practical points: check the blind spot and avoid changing lanes at bends. These are safety recommendations on SPF’s guidance page (SPF, Road Safety Tips for Drivers).

U-turns

Do not make a U-turn at a road intersection, junction, or opening in a road divider unless a traffic sign permits it (Singapore Statutes Online, Highway Code, para. 66).

Coverage debt

This article summarizes Highway Code paragraphs 49A–66. The current SSO Part IV text search returned the complete active text of paragraphs 49A–66; this check confirmed the paragraph text cited above. The section does not catalogue every lane marking or sign illustration. Related guidance on moving off, mirrors and signals, junction conduct, and reversing is covered in moving-off-mirrors-and-signals, junction-priority-and-turning, and following-distance-and-stopping-distance (Singapore Statutes Online, Highway Code, Part IV current text).
Paragraph 101 does not define “large vehicles” with a size or weight threshold; this article preserves the Code’s wording and does not infer a statutory vehicle class from it.
Expressway restrictions and vehicle-specific lane requirements are covered separately in expressway-and-tunnel-rules and commercial-vehicle-operating-restrictions.