At which impact speed must you reckon with serious or deadly injuries when no safety belt is worn?

In the context of traffic safety, the impact speed at which serious or deadly injuries can occur varies depending on several factors, including whether safety belts are used. It is understood that injuries can become significantly more severe at higher speeds.

The correct answer indicates that serious and potentially deadly injuries can be expected from a speed of 30 km/h onward, which aligns with research showing that unbelted occupants are at high risk of injury in collisions starting at this speed. The additional options reflect that while injuries become increasingly likely at higher speeds, the threshold for serious or deadly injuries begins at 30 km/h.

It is important to be aware of the risks involved at all speeds and the effectiveness of safety equipment, such as seat belts, in reducing these risks. Understanding this helps reinforce why wearing a seat belt is vital, as it significantly lowers the chances of severe injuries in accidents.