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A Yellow box junction is easily identifiable by its road markings, it is a box which is painted with a diagonal yellow criss-cross grid design as shown below. The box junction is a traffic measure that is used to keep traffic flowing freely.

Rule 174 Road Junctions

Box junctions. These have criss-cross yellow lines painted on the road (see 'Road markings'). You MUST NOT enter the box until your exit road or lane is clear. However, you may enter the box and wait when you want to turn right, and are only stopped from doing so by oncoming traffic, or by other vehicles waiting to turn right. At signalled roundabouts you MUST NOT enter the box unless you can cross over it completely without stopping.


Box junctions are designed to stop the junction becoming blocked by queuing traffic. It is illegal to enter the area of yellow crisscross lines marked on the road at a box junction unless your exit road is clear.




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