How do you mark an agricultural machine that has a width of more than 340 cm?

1. A “caution! Overload” sign is hanged on the machine’s rear, and reflective triangles are placed during light time.
2. The machine is marked with flickering yellow side lamps that are seen to a distance of 150 meters, both day and night.
3. The machine is marked with a white triangle in front and a white triangle with red edges at the machine’s rear.
4. Correct answer: A “caution! Wide vehicle” sign is hung on the front, and width warning lights are illuminated during lighting up time.

WhyFarm machinery wider than 340 cm carries a 'Caution! Wide vehicle' sign in front, and its width lights are on in the dark and in poor visibility.