As a resident, you want to drive into a cycle highway that has this sign. What must you be aware of when doing so?

This sign indicates a "Fahrradstraße" (bicycle street), where bicycles have priority, and motor vehicles are allowed only if they are residents or otherwise permitted ("Anlieger frei" means residents or local traffic allowed).

The key rules to understand here are:

1. Vehicles other than bicycles must not exceed 30 km/h in this area, ensuring safety for cyclists.
2. Bicycles are allowed to ride side by side, which is different from normal roads where riding next to each other is often not allowed.
3. Motor vehicles must not impede cycle traffic. Since bicycles have priority, cars must give way and ensure they do not block or endanger cyclists.

All these rules serve to create a safer and more comfortable environment for cyclists while allowing local vehicles access under restrictions. Your full understanding that these three points apply is correct.