Visual warning devices placed on the road when you have broken down must be visible for how far in both directions?

Answer: C — 150 m

The correct answer is that visual warning devices placed on the road when you have broken down must be visible for 150 meters in both directions. This regulation is important for ensuring the safety of both the driver and other road users. By requiring the warning devices to be visible from this distance, it gives approaching drivers ample time to notice the hazard and react accordingly, which can help prevent accidents. Visibility at this distance ensures that other vehicles can slow down, maneuver safely, and avoid potential collisions with the stationary vehicle or any occupants. This standard is established to promote safe practices on the road and highlights the importance of being proactive in alerting others to a breakdown situation. The distances specified in other options do not adequately provide enough warning time for approaching vehicles, which is why they are not the correct standards for visual warning devices.