What is the meaning of the following traffic sign?

1. Correct answer: No entry for freight-carrying vehicles, the height of which (vehicle and freight), exceeds the height that is indicated in the sign.
2. No entry for vehicles with a freight width exceeding the width that is indicated in the sign.
3. No entry for vehicles the height of which is less than the height that is indicated in the sign.
4. Entry is only permitted for non-motor vehicles with a minimum height of three meters.

WhyThe sign with arrows at the top and bottom limits the height of the vehicle with or without cargo. If it is higher than shown, it may not enter.