When a vehicle behind you flashes its lights with an intention to pass you should?

When a vehicle behind you flashes its lights intending to pass, you should safely and promptly check your mirrors and blind spots. If it's safe to do so, signal your intention to change lanes or move to the right to allow the vehicle to pass. Always ensure you maintain a safe speed and distance from other vehicles while doing this. If you cannot safely change lanes, remain in your lane and allow the vehicle to pass when it's safe.