How must you act when driving a vehicle during permitted delivery times?

The sign in the image indicates a pedestrian zone where only delivery vehicles are allowed during permitted delivery times ("Lieferverkehr frei"). In such zones, vehicles must drive at walking speed to ensure pedestrian safety. Additionally, drivers must remain vigilant and watch out closely for pedestrians at all times, as pedestrians have priority. Even if no pedestrians are currently near, it is not allowed to exceed walking speed because the area is primarily for pedestrian use and the safety risk is high. This is why both driving at walking speed and keeping a close lookout for pedestrians are mandatory rules in these delivery zones.