What is true of permanently illuminated signs?

Permanently illuminated signs in Germany provide critical information for traffic management.

1. The first point indicates that such signs may regulate traffic flow by either blocking lanes (indicated by red lights) or opening them up (indicated by green or yellow lights). This is essential for maintaining safe conditions on the road.

2. The second point specifies that vehicles are prohibited from stopping on the side of the carriageways where these illuminated signs are present. This is crucial to avoid hazards and ensure smooth traffic flow, as stopping can lead to accidents or obstructions.

The third point, which is not correct, suggests that these signs only apply to multi-track motor vehicles; however, they are relevant for all types of road users.

Understanding these rules helps drivers respond appropriately to traffic signs, enhancing road safety and efficiency.