What is the statutory speed limit within a '30 km/h Zone' (Tempo-30-Zone) and what priority rule applies at unmarked intersections within it?

1. Speed limit is 30 km/h; priority from the right (Rechtsvortritt) generally applies at all intersections unless explicitly signed otherwise
2. Speed limit is 30 km/h; the wider street always has priority
3. Speed limit is 30 km/h; pedestrians have absolute right-of-way across all street sections
4. Speed limit is 30 km/h; parking is free and unlimited everywhere