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

• Possible answers:

   
• A. To pass traffic that's queuing back at a junction
• B. To pass a car signalling to turn left ahead
• C. To pass a road maintenance vehicle travelling at 10 mph or less
• D. To pass a vehicle that's towing a trailer