What is true of permanently illuminated signs?

Permanently illuminated signs above lanes on a motorway or multi-lane road are used to manage traffic flow. A red X means the lane is closed and must not be used, while a green arrow means the lane is open to traffic. Sometimes a yellow arrow indicates a lane closure ahead or requires you to change lanes.

Additionally, stopping on the side of the carriageway where these signs are permanently illuminated is prohibited, except in emergencies. This helps maintain smooth and safe traffic flow.

These rules apply to all vehicles on such roads, not just multi-track motor vehicles, so the signs are relevant to everyone using these lanes.

Understanding these signs helps drivers stay in the correct lanes, avoid accidents, and ensure safe, efficient traffic movement.