What is the meaning of the following traffic sign?

1. Correct answer: No stopping or parking on the road-side where the sign is placed.
2. No stopping for vehicles on both sides of the road.
3. Stopping is permitted but parking is prohibited.
4. It is allowed to stop and park, except on Saturdays and holidays.

WhySign 433 prohibits stopping and parking on the side of the road where it stands, including the shoulder. The opposite side is not affected.