Which vehicles are prohibited from using a road sign-posted like this?

This traffic sign indicates a prohibition for trucks, specifically targeting vehicles whose permissible total mass exceeds 3.5 tons, including truck tractors. According to German traffic rules, trucks over this weight limit are not allowed to use the road where this sign is posted. Cars with trailers are not restricted by this sign unless specified otherwise.

The rule exists to prevent heavy vehicles from using certain roads that may be unsuitable due to weight limits, road conditions, or safety concerns. Always pay attention to additional signs or information plates that might indicate exceptions or specific weight limits.

Understanding this sign helps ensure compliance with road restrictions and promotes safe traffic flow by keeping heavy vehicles off roads that cannot safely accommodate them.