What is the meaning of the following traffic sign?

1. Correct answer: Cab rank; no stopping and parking of other vehicles, except for unloading passengers.
2. Pick-up stop; no stopping and parking of other vehicles.
3. No stopping and parking for any vehicle within a distance of 20 meters.
4. Route service station for special cabs and busses.

WhyA cab rank sign prohibits other vehicles from stopping and parking there. They may only drop off a passenger.