How long should you wait at a railway crossing after a train has passed?

• Until the signal lights stop flashing
• Until the gate or barrier rises completely.
• Both A and B
  Explanation:

  "After a train has passed, wait at the railway crossing until the signal lights stop flashing and the gate or barrier (if present) has fully risen. This ensures the tracks are clear and it is safe to proceed."
• Until another train arrives.