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Question:

You are approaching an emergency vehicle parked on the side of the road with its flashing lights switched on. What must you do?

A
Explaination

You should leave a vacant lane next to an emergency vehicle that is stopped with its flashing lights on. If changing lanes is unsafe or impossible, you should slow to a safe and reasonable speed and proceed with caution. [B. Emergency Vehicles, Section VII - Sharing the Road, Maryland Driver's Manual]