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

The sign portrays a prohibition for certain vehicles, specifically heavy vehicles.

In Germany, this particular road sign indicates that trucks with a permissible total mass exceeding 3.5 tons and truck tractors are not allowed to use the marked road. The reasoning behind this restriction could include safety concerns, road conditions, or preservation of infrastructure.

Cars with trailers are not prohibited by this sign, meaning they can use the road. Understanding the distinctions between types of vehicles and their regulations is essential for compliant and safe driving, as each sign aims to manage traffic flow and ensure the safety of all road users.