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When may you cross a double solid white line in the middle of the road?

To pass traffic that's queuing back at a junction

To pass a car signalling to turn left ahead

To pass a road maintenance vehicle travelling at 10 mph or less
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To pass a vehicle that's towing a trailer

You may cross the solid white line to pass a stationary vehicle or to pass a pedal cycle, horse or road maintenance vehicle if it’s travelling at 10 mph or less. You may also cross the solid white line to enter a side road or access a property.