Yellow box junction rules UK: the right-turn exception explained
The rule for yellow box junctions is simple: do not enter unless your exit road is clear and there is enough space on the other side for your vehicle to clear the grid without stopping. The one exception is turning right - you can wait inside the box if oncoming traffic is preventing you from completing the turn.
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What is a yellow box junction?
A yellow box junction is the criss-cross grid of yellow lines painted on the road at busy junctions and road entrances. Its purpose is to prevent vehicles from blocking the junction and stopping cross-traffic from moving.
Highway Code Rule 174 sets out the rule: you must not enter the box unless your exit road is clear. If traffic on the far side of the junction is queuing, you must wait outside the box - even if the light is green and the traffic behind you is moving. Entering the box when your exit is blocked is the offence, and it can be caught on camera.
The right-turn exception
There is one exception to the rule: if you intend to turn right and are prevented from completing the turn by oncoming traffic or by other vehicles waiting to turn right, you may enter the box and wait.
This exception exists because a right-turning vehicle must be positioned in the junction to complete the turn once oncoming traffic clears. Without it, right-turning vehicles would have to wait indefinitely outside the box, blocking the lane behind them. Rule 174 specifically permits waiting in the box in this situation - but only if the exit road you are turning into is also clear. If your intended exit road is blocked, the exception does not apply and you should wait outside the box.
Common mistakes that lead to fines
The most frequent error is misjudging whether the exit will be clear by the time you reach it. The junction looks open when you set off but traffic ahead stops before you clear the grid - and you are left stranded inside the box.
Other common mistakes: entering the box when turning left, where no exception applies and the exit must be clear like any other direction; following the car in front into the box without independently checking your own exit is clear; and stopping at a red light while positioned inside the box, which is an offence even though you did not cross while the light was red.
Other stopping and waiting restrictions apply beyond the junction itself - our guide to UK parking rules covers yellow lines, clearways, and the rules around loading bays.
What happens if you stop in a yellow box?
Stopping in a yellow box unlawfully results in a Penalty Charge Notice (PCN), issued by the local authority rather than the police. Because this is a civil penalty rather than a criminal offence, it does not carry penalty points - the consequence is financial only, the same as a parking ticket.
This is a meaningful distinction: a yellow box fine does not go on your driving licence and does not need to be declared to your insurer. Unlike a careless driving fixed penalty notice, it has no long-term premium or licence consequence beyond paying the fine.
How much is the fine?
A PCN for a yellow box offence typically runs from £70 to £130 depending on the local authority. Most offer a 50% reduction if paid within 14 to 21 days, bringing the effective penalty to £35 to £65.
The City of London has some of the most actively enforced yellow box cameras in the country. If you challenge a PCN and are unsuccessful, the full charge becomes payable. Failing to respond to a PCN - neither paying nor challenging - can result in the debt being referred to enforcement agents, adding significant costs.
How are yellow box junctions enforced?
Enforcement is camera-based. Local authorities operate CCTV at busy junctions and review footage to identify vehicles that have stopped in the box in contravention of Rule 174. Many cameras are positioned above the junction to capture a clear overhead view.
Because the scheme is civil rather than criminal, authorities issue PCNs based solely on camera evidence without police involvement. Some urban junctions issue hundreds of notices per month. There is no discretionary warning: if footage shows your vehicle stopped in the box unlawfully, a PCN will follow in the post.
Driving a borrowed car in the city?
Yellow box fines are civil penalties sent to the registered keeper. If you are driving someone else's car when the camera captures the offence, the PCN arrives at the owner's address - they must then identify you as the driver and redirect it. To keep any trip in a borrowed car straightforward, temporary car insurance provides standalone cover for the journey and keeps any incidents separate from the owner's annual policy. Their no claims discount stays protected.
Frequently asked questions
What is the rule for a yellow box junction?
Highway Code Rule 174 states that you must not enter a yellow box junction unless your exit road is clear. If traffic on the far side of the junction is queuing, wait outside the box - even if the light is green. The one exception is for right turns: you may enter and wait if oncoming traffic is preventing you from completing the turn, provided your intended exit is clear.
Can you wait in a yellow box junction when turning right?
Yes - this is the only exception to the rule. If you are turning right and are held in the junction by oncoming traffic or by other vehicles waiting to turn right, you may enter the box and wait. Your intended exit road must still be clear. If the road you are turning into is also congested, the exception does not apply.
How much is a yellow box junction fine in the UK?
A Penalty Charge Notice for a yellow box offence typically runs from £70 to £130 depending on the local authority. Most offer a 50% discount for payment within 14 to 21 days, reducing the effective amount to £35 to £65. The City of London and Transport for London tend toward the higher end of the range.
Do yellow box fines add points to your licence?
No. Yellow box fines are civil penalties issued by local authorities - they are treated the same way as parking tickets. There are no penalty points, no criminal record and no requirement to declare the offence to your insurer. The consequence is financial only.
How are yellow box junctions enforced?
Primarily by CCTV cameras operated by local authorities, often positioned above the junction to capture a clear overhead view. Camera footage is reviewed and PCNs are issued to the registered keeper. There is no discretionary warning system - if footage shows your vehicle stopped in the box unlawfully, a penalty notice will follow in the post.
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