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BOX JUNCTIONS
Understand the yellow box — rules, exceptions and fines explained.
Box junctions keep traffic flowing at busy crossroads. Learn when you can and cannot enter, what the fine is for stopping illegally, and how to navigate them safely.
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What is a box junction?
A box junction (also known as a yellow box junction) is a road traffic control measure marked by criss-cross yellow lines forming a square or rectangle on the road surface. Yellow box junctions are designed to keep junctions clear, maintain traffic flow and reduce delays, especially during busy periods. They can be found at busy crossroads, T-junctions, roundabouts and outside emergency services.
The box junction rules
The rule is simple: do not enter a box junction unless your exit is clear. You must not enter if stopping would block the junction for other vehicles. The one exception is when turning right — you may wait in the box if your exit road is clear but you are held by oncoming traffic or by other vehicles turning right.
Clear Exit Rule
Never enter a box junction unless the road beyond it is clear enough for your vehicle to exit without stopping.
Turning Right Exception
You may wait in the box when turning right if your exit is clear but oncoming traffic or right-turning vehicles are preventing you from completing the turn.
Penalty Charge Notices
Stopping illegally in a box junction can result in a PCN of up to £130 in London and £70–£100 elsewhere, enforced by camera.
Approach with Caution
Check traffic is moving freely ahead before entering. Green lights do not give you permission to enter if the exit is blocked.
Emergency Stations
Box junctions outside fire stations keep the exit clear at all times. The same rules apply — you must not stop in them.
Theory Test Topic
Box junction rules are a common topic in the driving theory test. Knowing the exception for turning right is especially important.
How to use a box junction safely
As you approach, scan ahead to confirm the exit is clear. Look for pedestrians, cyclists and other vehicles. If the exit is blocked — even if the lights are green — wait before the box. When turning right, position your vehicle correctly, look for a safe gap and move forward only when you can complete the turn without stopping mid-junction.
Build your driving confidence with RED
Our instructors will guide you through busy junctions including box junctions during your lessons.
