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Login MyRed Box junctions – everything you need to know
In this guide, we’ll cover what a box junction is, box junction rules, when you're allowed to wait in one, turning right, fines, and practical tips to keep you moving safely.
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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.
Box junctions can commonly be found at busy crossroads, T-junctions, and roundabouts. These road features are also found outside emergency services, such as fire stations, to allow the entrance to be kept clear in case of an emergency.
The yellow box junctions have a set of rules that drivers must follow for them to be effective. Here are the main rules and one exception:
When you approach a box junction, do not enter unless your exit is clear. Drivers must not enter a box junction unless there is enough space on the other side for their vehicle to clear the box completely. This helps keep junctions free-flowing and prevents gridlock.
There’s no official time limit in the box, but drivers are not allowed to unnecessarily stop. You must not enter the yellow box if your exit is clear, as this will block the junction and therefore other vehicles. The only time drivers are allowed to stop is when turning right and there is a clear exit. What matters is whether you are lawfully waiting (e.g., turning right and held by oncoming traffic) rather than blocking the junction illegally.
The only exception to stopping at a yellow box junction is when turning right, the exit is clear, and if prevented from moving forward by oncoming traffic.
Stopping illegally in a yellow box junction can result in a Penalty Charge Notice (PCN). These fines are usually issued by local councils through camera enforcement and can cost up to £130 in London (reduced if paid promptly). Outside London, the amount varies but typically ranges from £70–£100.
When approaching a box junction, drivers must approach with caution: Check the traffic ahead and ensure your exit is clear before entering. If turning right, look for a safe gap in oncoming traffic before moving. Never enter the box if stopping would obstruct other vehicles.
Key safety tips to remember when driving and driver approaches a yellow box junction are:
If you’re unsure, it’s safer to wait than risk a fine or unsafe manoeuvre.
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You may wait in a box junction if you are turning right and your way is blocked either by oncoming traffic or other vehicles turning right. In this case, you’re allowed to enter the box and wait as long as your exit road will be clear once the obstruction moves.
There is no specific time limit; what matters is the reason for stopping. If you’re trying to go straight but there’s no space ahead, you may be fined, regardless of how long you were stationary. If you’re turning right and waiting for a safe gap, that’s permitted, regardless of duration.
Drivers can turn right at a box junction, but only if their exit is clear and they are not held up by oncoming traffic or other right-turning vehicles. Never turn if your exit is blocked or if there’s no space to complete the turn.
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