Road markings
Yellow box junction
What it means
Criss-cross yellow lines painted across a junction, so that queuing traffic does not block it for everyone else. You MUST NOT enter the box until your exit road or lane is clear (Rule 174). The exception is turning right: you may enter the box and wait when you are only stopped from turning 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.
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Highway Code Rule 174 — read it on GOV.UK
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Other road markings
Road marking pictures: The Highway Code (Department for Transport and Driver and Vehicle Standards Agency), © Crown copyright. Used under the Open Government Licence v3.0.