What situation applies according to this traffic sign?

This traffic sign indicates a speed limit of 30 km/h and specifies noise protection measures. The supplementary sign shows that the restriction applies from 10 PM to 6 AM.

In this case, the speed limit is enforced during nighttime hours to reduce noise pollution for residents in the area. Adhering to this regulation is important not only for traffic safety but also for respecting the peace and comfort of those living nearby.

It's crucial to note that the sign does not mention any exceptions for electric vehicles, meaning they must also comply with the same speed limit during the applicable hours.