
When you need to pass a vehicle with a trailer
When passing a slow-moving maintenance vehicle (10 mph or less)
When passing a queue of traffic
When a car ahead is indicating left
Explanation: It is permitted to pass over the solid white line in the middle of the road to pass a stationary vehicle, or to overtake a cyclist, horse, or vehicle travelling at under 10 mph. Access to some properties might also require you to cross a solid white line; this is also permitted.
Category: Road and traffic signs (2021)
References: The Official DVSA Guide to Driving: Section 6, Highway Code: Rule 129, Highway Code: Page 114, Know Your Traffic Signs: Page 64
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