What should you do when the crossbuck sign at a railroad crossing has flashing red lights?

• Stop immediately, as a train is approaching
  Explanation:

  "When the crossbuck sign at a railroad crossing has flashing red lights, you must stop. Flashing red lights indicate that a train is either on the tracks or approaching. It's crucial to wait until the lights stop flashing and, if present, the gate or barrier is fully raised before proceeding."
• Accelerate to clear the tracks quickly
• Proceed with caution, but be prepared to stop
• Ignore the flashing lights and proceed across the tracks