Which vehicles can cause serious accidents when this traffic sign is ignored?

The sign indicates a height restriction of 3.8 meters for vehicles. This means that any vehicle exceeding this height is prohibited from passing under it. Such restrictions are crucial for ensuring safety, as taller vehicles could potentially collide with structures like bridges or overhead signs, leading to serious accidents.

In terms of your quiz, vehicles that exceed this height can cause serious accidents if they attempt to navigate under the restriction without heeding the sign. Therefore, all vehicles taller than 3.8 meters should be considered when determining which ones can cause significant hazards, as adhering to height limits helps prevent collisions and ensures smoother traffic flow. Always pay attention to such signs when driving to avoid risks associated with height violations.