In which cases must a vehicle have its hazard warning lights turned on?

• 1On the towing vehicle.
• 2On a motor vehicle marked with an identification mark "Children," which is transporting an organized group of children, during the boarding or alighting of children.
• 3On all motor vehicles of the convoy during their stop on the road.
• 4Answers 2 and 3.
• 5Answers 1, 2, and 3.