Why is it dangerous to drive an agricultural tractor on a paved public road at night without functional rear red lights and reflectors?

1. Tractors become too fast in the dark
2. Trailing motorists traveling at 100–120 km/h will perceive a dark tractor as an unlit wall on the highway, resulting in fatal rear-end underride collisions before they can react
3. The tractor will run out of oil
4. The tractor battery will overcharge