Does the visible sign indicate that vehicles with a height (including cargo) greater than 3 metres are prohibited from traffic?

Yes. The visible B-16 sign 'No entry for vehicles with a height exceeding 3 m' belongs to the category of prohibition signs. It means that the entry of vehicles whose overall height (including the load) exceeds the value shown on the sign is prohibited. This sign has been placed before a passage under a building to prevent a vehicle that is too high from hitting the structure.