No entry for freight-carrying vehicles the width of which (vehicle and freight) exceeds the width indicated in the sign

What is the meaning of the following traffic sign?

1. No entry for vehicles the width of which is less than the width indicated in the sign.
2. Correct answer: No entry for freight-carrying vehicles the width of which (vehicle and freight) exceeds the width indicated in the sign.
3. No entry only for commercial vehicles the width of which exceeds the width indicated in the sign.
4. No entry for non-motor vehicles only.