What should you do when you encounter flashing red warning lights at a railroad crossing, even if you do not see a train?

• You must come to a complete stop and only proceed when the way is clear.
  Explanation:

  "If an alternately flashing red signal is located at a railroad crossing, you must come to a complete stop, even if you do not see a train, and proceed when the way is clear."
• You don't need to stop if you can't see the train.
• You must speed up and cross the track as soon as possible.
• Both A & C