Lanes may be restricted for use by particular types of vehicle or for a designated purpose: these restrictions may apply some or all of the time. The operating times and vehicle types will be indicated on the accompanying traffic signs.
Don't drive in designated purpose lanes during their times of operation unless signs indicate that your vehicle is permitted.
Overhead signals are used to help control specific lanes, e.g. by closing them or by applying a speed limit to that lane. A lane marked with:
- A white arrow pointing to another lane indicates that the lane you are currently in is about to close and that you must move to another lane.
- A red cross indicates you must not travel in that lane.
- The national speed limit sign indicates the national speed limit applies after the incident.
If there is a speed limit sign above a lane, you must obey the speed limit for that lane.