If the red lights continue to flash at a railway level crossing after the train has passed, what should you do?

If the red lights continue to flash at a railway level crossing after the train has passed, what should you do?undefined
Wait for 15 seconds then drive on
Check both ways. If nothing's coming, then cross
Wait until they stop flashing, check both ways, then cross

"Continue to wait until the red light goes out before proceeding."