
When oncoming traffic prevents you from turning right
When you're in a queue of traffic turning left
When you're in a queue of traffic going ahead
When you're on a roundabout
Explanation: The purpose of yellow box markings is to keep junctions clear of queuing traffic. You may only wait in the marked area when you're turning right and your exit lane is clear but you can't complete the turn because of oncoming traffic or other traffic waiting to turn right.
Category: Rules of the road
References: The Official DVSA Guide to Driving: Section 6, Highway Code: Rule 174
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