什么时候必须打开汽车的头灯？When must you turn your vehicle headlights on?
日落超过三十分钟、或距离日出还有三十分钟以上，必须打开30 minutes after sunset until 30 minutes before sunrise
雾天In fog
当你无法看清前方100米处的人或车辆时When you can't see a person or vehicle 100 metres ahead of you
以上都正确All of the above