The sign "Motor vehicles with a permissible total weight over 3.5 t" indicates that only vehicles that weigh more than 3.5 tons are not allowed to enter a certain area or road. This is often used in urban areas or near roadways where heavier vehicles could cause damage to infrastructure or create safety hazards for other road users.

When you see this sign, it is important for drivers of vehicles under 3.5 tons to know that they are allowed to enter, while drivers of heavier vehicles must find alternative routes. Always pay attention to such signs to ensure you comply with local regulations and avoid penalties.