You can challenge a box junction PCN by making representations to the issuing authority within 28 days, and appealing free of charge to an independent adjudicator if rejected. The grounds that succeed most often are: the exit was clear on entry and became blocked unforeseeably, the stop was forced by another vehicle or an emergency, the driver was waiting to turn right (which the rules permit), the markings did not comply with TSRGD 2016, or the camera footage does not establish the contravention.
Box junction penalties are issued entirely by camera, in very high volume, at junctions councils select precisely because they generate contraventions. That volume is why so many of these PCNs contain a challengeable defect.
The rule, precisely
Highway Code Rule 174: you must not enter the box until your exit road or lane is clear.
The exception: you may enter the box and wait when you want to turn right, and are stopped from doing so only by oncoming traffic or by other vehicles waiting to turn right.
The markings are prescribed by the Traffic Signs Regulations and General Directions 2016. The contravention enforced by councils is code 31: entering and stopping in a box junction when prohibited.
Read that carefully, because every word carries weight. The contravention is not "being in the box". It is entering when the exit is not clear, and stopping. Enforcement decisions frequently gloss over the difference. Adjudicators do not.
Who can fine you
In London, boroughs and TfL have enforced box junctions by camera for years under the London Local Authorities and Transport for London Act 2003. Outside London, councils gained the same ability from 31 May 2022 under Part 6 of the Traffic Management Act 2004, once granted a Designation Order. The wider framework, deadlines and appeal routes are covered in the moving traffic PCN guide.
The grounds that succeed
1. Your exit was clear when you entered.
The rule regulates the moment of entry. If your exit was clear when you committed to the box and became blocked by something you could not reasonably anticipate (a lane-changer cutting into your exit, a vehicle ahead braking without warning, a pedestrian), the contravention as defined may not have occurred. Two camera stills, one of entry and one of the stop, cannot show what your exit looked like at the moment you entered. Demand the full video.
2. You were waiting to turn right.
Waiting in the box to turn right, held only by oncoming traffic or other right-turners, is expressly permitted. PCNs are issued to right-turning vehicles anyway. If that was you, this is a complete answer.
3. The stop was forced.
An emergency vehicle behind you, a vehicle reversing towards you, a police direction, an obstruction that appeared after entry. A stop compelled by events outside your control is the classic compelling circumstance, and specific accounts supported by the footage succeed regularly.
4. The markings were defective.
Yellow box markings must substantially comply with TSRGD 2016. Heavily worn paint, incomplete cross-hatching, and boxes painted where or how the regulations do not permit are recognised grounds. Councils repaint quietly after complaints, so photograph the junction from the driver's approach early.
5. The evidence does not prove the contravention.
The camera must be an approved device under SI 2022/71, and the footage must show entry, the state of the exit, and the stop. Stills showing a stationary vehicle in a box prove almost nothing about the moment that matters. The authority carries the burden of proof.
Challenge your box junction PCN with the right letter
The Code 31 Box Junction Challenge Letter covers marking compliance, forced stops, the right-turn exception and camera evidence. £15.
What does not work
- "Everyone does it at this junction." Irrelevant to your case, however true.
- "I was only stopped for a few seconds." Duration is not an element of the contravention, though very brief stops can support a forced-stop or exit-was-clear account.
- "I didn't see the box." Unless the markings were defective or obscured, this is an admission, not a defence.
- An apology and an explanation of your day. Case officers cannot cancel penalties out of sympathy. Give them a legal reason.
Put the authority to proof
A box junction challenge is an evidence case. The representations that succeed identify the element of the contravention the authority cannot prove, cite the rule and the regulations precisely, and demand the specific footage and records that decide it.
The Code 31 Box Junction Challenge Letter is structured on those grounds, with the evidence demands built in, for £15.
The letter for this
Council PCN Code 31, Entering and stopping in a box junction when prohibited
Written for this specific ground, with the law cited and the evidence demands built in. Complete the placeholders and send it.
Included free with the letter
- How to Submit Your Tribunal Appeal
- How Council Parking Appeals Work
Frequently asked questions
What is the actual box junction rule?
Highway Code Rule 174: you must not enter a yellow box junction unless your exit road or lane is clear. The exception is turning right. You may enter the box and wait when you want to turn right and are prevented from doing so only by oncoming traffic, or by other vehicles waiting to turn right. The markings themselves are prescribed by the Traffic Signs Regulations and General Directions 2016.
Is stopping in a yellow box a criminal offence?
No. It is a civil contravention (code 31: entering and stopping in a box junction when prohibited) enforced by councils and TfL through camera-issued Penalty Charge Notices. No points, no criminal record, no insurance effect. The dispute is decided on evidence and law, first by the authority and then by an independent adjudicator if you appeal.
My exit was clear when I entered, then someone cut in. Do I have to pay?
This is one of the strongest and most common defences. The contravention is entering when your exit is not clear. If your exit was clear at the moment of entry and became blocked by an event you could not reasonably have anticipated, such as a vehicle changing lanes into your exit or a pedestrian stepping out, the contravention as defined may not have occurred. The full video, not the stills, usually decides this.
Can I be fined if I was forced into the box?
If you stopped in the box because of circumstances outside your control, for example a vehicle ahead reversing, an emergency vehicle requiring you to move, or a police direction, say so precisely in your representations. Adjudicators regularly accept forced-stop explanations that are specific and consistent with the footage.
What if the yellow box markings were faded or wrongly painted?
Box junction markings must substantially comply with the specifications in TSRGD 2016. Markings that are heavily worn, incomplete, or painted in a layout the regulations do not permit are a recognised ground of challenge. Photograph the box from the driver's approach as soon as you can after receiving the PCN.
How long do I have to challenge a box junction PCN?
The notice arrives by post and states your deadlines. You normally have 28 days to make representations, and paying the discounted amount within the discount period ends your right to challenge. If the authority rejects your representations, you have 28 days to appeal to London Tribunals (in London) or the Traffic Penalty Tribunal (outside London). Both are free.
Make the council prove every element.
The Code 31 Box Junction Challenge Letter covers exit-was-clear, forced stops, the right-turn exception, marking compliance and camera evidence demands.