You may wait in a box junction only if you are turning right and are prevented from doing so by oncoming traffic or other vehicles also waiting to turn right. In this case, it is legal to enter the box and wait inside it. Otherwise, you must not stop or wait in a box junction, and you should only enter if your exit is clear.
Key points about waiting in a box junction:
- You are allowed to wait in the box junction if turning right and blocked by oncoming traffic or vehicles waiting to turn right.
- You must ensure your exit is clear before entering except in the right-turn situation.
- No other reason allows stopping in a box junction; stopping otherwise can result in a fine.
- The rule aims to keep traffic flowing and prevent gridlock at junctions.
This is consistent across UK driving rules and explained by sources such as the Highway Code and driving theory test guides.
