Which of the listed definitions corresponds to the term column of vehicles:

• 1An organized group of two vehicles travelling together in the same direction directly one behind the other with low-beam headlights permanently on.
• 2An organized group of three or more vehicles travelling together in the same direction directly one behind the other with low-beam headlights permanently on.
• 3An organized group of two vehicles travelling together in the same direction directly one behind the other with hazard warning lights permanently on.
• 4An organized group of three or more vehicles travelling together in the same direction directly one behind the other with hazard warning lights permanently on.