What is the meaning of the following traffic sign?

1. Entry is permitted for commercial motor vehicles with an overall weight which exceeds the weight indicated in the sign.
2. Correct answer: No entry for commercial motor vehicles with an overall weight which exceeds the weight indicated in the sign.
3. No entry for any type of vehicle that has a higher all up weight than what is indicated in the sign.
4. Entry is permitted for all motor vehicles.

WhyThe sign with a truck and tons prohibits entry to commercial vehicles heavier than the weight shown. Lighter ones may enter.