What is the meaning of the following traffic sign?

No entry for any vehicle that has an all up weight which exceeds the weight indicated in the sign.

No entry only for commercial motor vehicles that have an all up weight which exceeds the weight indicated in the sign.

Entry is permitted for all commercial motor vehicles that have an all up weight which exceeds the weight indicated in the sign.

No entry only for public vehicles that have a lesser all up weight than what is indicated in the sign.