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," or cycle street, where bicycles have priority. The additional sign "Anlieger frei" means that local residents or people with legitimate reasons (e.g., deliveries) are allowed to enter by vehicle.

The rules for such cycle streets are:
1. Vehicles other than bicycles may enter only if explicitly allowed (like residents here), but they must not exceed 30 km/h to ensure safety for cyclists.
2. Cyclists are allowed to ride side by side, which is important for their comfort and convenience on these streets.
3. Motor vehicles must not obstruct or impede bicycle traffic in any way, respecting the priority of cyclists.

Therefore, as a resident driving on a cycle street, you must not drive faster than 30 km/h, allow cyclists to ride side by side, and avoid blocking or hindering their movement. This maintains a safe and cyclist-friendly environment.