What vehicles may enter a zone with this sign?

The sign indicates a zone where bicycles are allowed, and the additional sign "Anlieger frei" means that residents' vehicles may also enter.

According to German traffic laws, this specific zone permits bicycles and vehicles driven by residents, but not small electric vehicles. The correct combination of answers includes bicycles (1), small electric vehicles (2), and vehicles driven by residents (3).

Therefore, for these zones, it's important to recognize that residents are granted special access, which is why selecting all relevant options in a quiz about this topic is crucial for understanding traffic rules in residential areas.