When the following road sign is placed:

- Only buses are permitted to stop.
- Passenger loading is permitted on holidays only.
- Correct answer: Only taxis are permitted to stop.
- Only unloading of workers is permitted.
Why this is the answer
The correct answer in the official bank: Only taxis are permitted to stop.
This one sign combines the taxi symbol and the no-parking symbol. It permits stopping at the place for taxis only. Buses and other vehicles are not covered by this permission, and the sign says nothing about holidays or unloading workers.