FineFlip Guide
Yellow Box Junction Rules: When Can You Enter?
Yellow box junctions are among the most misunderstood traffic features in the UK. The basic rule is simple — do not enter unless your exit is clear — but the right-turn exception and the role of other traffic create situations where drivers are unfairly fined. This guide explains the rules and when to appeal.
Box junction fine?
The right-turn exception and exit-blocked-by-others defence are strong appeal grounds.
Check my appeal freeThe basic rule
You must not enter a yellow box junction unless your exit road or lane is clear. If traffic ahead means you would have to stop within the yellow hatching, you must wait before the box. This applies even if your traffic light is green.
The right-turn exception
You may enter the box to turn right, even if you have to stop and wait for oncoming traffic to clear. This is the only exception to the "exit must be clear" rule. However, if the exit road you are turning into is blocked by stationary traffic, you should not enter.
Common appeal scenarios
- You entered with a clear exit but traffic ahead stopped unexpectedly
- You were turning right and waited for oncoming traffic (valid exception)
- The box junction markings were worn, faded, or unclear
- Traffic lights changed while you were already in the box
- The CCTV footage shows your exit was clear when you entered
Related guides
Frequently asked questions
When can you enter a yellow box junction?
You can only enter a yellow box junction if your exit is clear — meaning you can drive completely through without stopping. The one exception is if you are turning right and are only prevented from completing the turn by oncoming traffic.
Is the right-turn exception real?
Yes. The Traffic Signs Regulations specifically allow you to enter a box junction when turning right, even if you have to stop and wait for oncoming traffic. However, you must not enter if you are blocked by a vehicle also turning right ahead of you.
How much is a yellow box junction fine?
In London, the PCN is GBP 160 (GBP 80 if paid within 14 days). Outside London, fines are typically GBP 70 (GBP 35 within 14 days).