Where does the zone of validity of a maximum speed limit sign (Sign 3.24) end if no repealing sign (3.25 or 3.31) is installed?

1. At the next nearest intersection, or at the end of the settlement (built-up area) if no intersection intervenes.
2. Exactly 500 meters after the sign in all cases.
3. At the next pedestrian crossing.
4. It remains in effect indefinitely across the entire administrative district.