At what distance from the vehicle must an emergency stop sign or a flashing red lantern be installed, in the cases provided for by the Road Traffic Rules, on roads in built-up areas?

• 1At a distance that ensures road safety, but no less than 20 m.
• 2At a distance that ensures road safety, but no less than 40 m.
• 3At a distance that ensures road safety, but no less than 50 m.
• 4At a distance that ensures road safety, but no less than 100 m.