What vehicles may enter a zone with this sign?

The sign indicates a zone where bicycles are allowed, while the lower sign, "Anlieger frei," means that only residents or property owners can enter with their vehicles. This confirms that bicycles, small electric vehicles, and vehicles driven by residents are permitted in this zone.

In this context, the first option (bicycles) is clearly correct, as bicycles are explicitly allowed. The second option (small electric vehicles) could be seen as permissible depending on local regulations, but usually, the primary focus is on bicycles. The third option (vehicles driven by residents) is also correct since residents can access these zones.

Therefore, the combination of all three options (bicycles, small electric vehicles, and vehicles driven by residents) reflects the full range of vehicles allowed in such a zone, adhering to German traffic regulations.