In a funeral procession, what things do you need to take care of while crossing a track?

• You must have your headlights on, and may only proceed if you are following immediately behind the vehicle ahead in the procession, and it is safe to do so.
  Explanation:

  "You must have your headlights on, and may only proceed if you are following immediately behind the vehicle ahead in the procession, and it is safe to do so."
• You must keep your headlights off, and may only proceed if you are following immediately behind the vehicle ahead in the procession, and it is safe to do so.
• You must have your headlights on, and may only proceed if you are following three cars behind the vehicle ahead in the procession, and it is safe to do so.
• You can proceed whenever you like.