What should vehicle drivers do when the red light begins to flash on this sign and a bell starts to ring?

• Get ready to go because a train is approaching.
• Stop because a train is approaching.
  Explanation:

  "When the red lights flash and the bells ring at a railway crossing, it means a train is approaching. Drivers must come to a complete stop and wait until the signals stop before proceeding. Ignoring these warnings is dangerous and illegal."
• Start because a train is approaching.
• It depends on what the speed of the train is.