What are the correct safety steps to follow at highway-rail grade crossings?

• Approach carefully, prepare to stop, look and listen, don't enter if you can't exit, look again, cross carefully, and keep going.
  Explanation:

  "Remember these steps for safety at highway- rail grade crossings: 1. Approach with care. 2. Prepare to stop. 3. Look both ways and listen carefully. 4. If it won't fit, don't commit. Do not enter a crossing unless you can drive completely through without stopping! 5. Look again. 6. Cross tracks with care. 7. Keep going once you start."
• Speed up, look both ways, cross quickly, stop in the middle to check for trains, and then continue.
• Approach carefully, stop in the middle, look both ways, cross slowly, and keep stopping to check for trains.
• Approach carefully, look one way, drive through quickly, stop halfway, and continue if no train is visible.