Yellow-box junctions in Singapore
What a yellow-box marking means, when entering one is an offence, and the current SPF-listed points and composition fine.
Primary source: https://sso.agc.gov.sg/SL/RTA1961-R20?ProvIds=pr26-
Yellow-box junctions in Singapore
What the marking means
The Road Traffic (Traffic Signs) Rules define a yellow box as yellow lines connecting the four corners of an area of road at a junction or elsewhere, in the forms shown in diagrams 140(a) to 140(d) (Singapore Statutes Online, Road Traffic (Traffic Signs) Rules, rule 7(8)).
When entering the box is an offence
Under rule 26 of the Road Traffic Rules, it is an offence to drive or ride, or turn any part of a vehicle into, a yellow box and thereby cause obstruction to another vehicle proceeding to or along the junction or marked area. This applies to a diagonally hatched junction box even when the traffic signals permit entry, and to another yellow box as defined in the Traffic Signs Rules even when the driver has right of way (Singapore Statutes Online, Road Traffic Rules, rule 26). The legal test stated in rule 26 includes causing obstruction; the rule does not say that merely entering any yellow box is automatically an offence.
SPF’s current Basic Theory of Driving handbook illustrates three situations in which a driver or rider will not be penalised for entering the yellow-box junction (SPF, Basic Theory of Driving handbook (2026 edition), pp. 54–55):
- Turning vehicles that would not block others. Only drivers of turning vehicles that would not obstruct other traffic if the lights changed may enter the yellow box when their exit lanes from it are blocked. Vehicles that would obstruct traffic should wait behind the stop-line.
- Waiting in the box to turn right against oncoming traffic. Those drivers can remain in the box until a suitable opportunity arises. Should the lights turn red against them, they should proceed to complete their turn and clear the yellow-box junction.
- Waiting in the box to turn left or right because pedestrians are crossing. Drivers may enter the yellow box even when they are prevented from executing their turns by pedestrians using the crossings.
The same handbook’s common-road-markings note for a yellow box is: do not drive into the yellow box when traffic has come to a standstill at the left lane; give way to vehicles from the side road entering the main road (SPF, Basic Theory of Driving handbook (2026 edition)). These are handbook examples; the offence wording remains the obstruction test in rule 26.
A Bus Give-Way Box is a different marking: it is a yellow painted section marked with an arrow after a Bus Give-Way Controlled Area and separated from it by a Bus Give-Way Line. When a bus is entering from a bus stop or bay, or is waiting there and signals its intention to enter, drivers and riders approaching through the controlled area must stop before the line and give way. A vehicle must also not obstruct a bus entering or about to enter the box (Road Traffic (Traffic Signs) Rules, rules 7(14)–(15); Road Traffic Rules, rule 26A).
Published penalty
SPF’s current traffic-offence table lists “Stopping in a yellow box” with no demerit points and a composition fine of $100 for a light vehicle or $150 for a heavy vehicle (SPF, Penalties for Traffic Offences). That table label does not replace Rule 26’s obstruction element: the rule defines the offence, while SPF publishes the composition amount. SPF says offences may still be prosecuted, in which case the full punishment for the offence applies (Singapore Statutes Online, Road Traffic Rules, rule 26; SPF, Penalties for Traffic Offences).
Coverage debt
This article summarizes the rule and the current published composition listing. It does not determine whether a particular vehicle movement caused obstruction; that depends on the facts of the case. The handbook’s three situations are illustrated with diagrams in the PDF that are not reproduced here.