Is it obligatory to turn-on the bus headlights during the day as well?

1. Yes, but only during winter, autumn and spring.
2. Yes, on city routes, when there are passengers on the vehicle.
3. No, except on intercity routes.
4. Correct answer: Yes, every year between November 1st and March 31st.

WhyA bus must drive with its headlights on during the day every year from November 1 to March 31, on any road.