Lane-use control by regulation

What it means

To guide you by means of a diagram, which indicates that, the right-hand lane of a two-lane carriageway or part of a carriageway is subject to a compulsory requirement of a 'command' or 'prohibition' regulatory sign. Opposing traffic flow is indicated by a dotted arrow

What you must do

Whenever a lane ends, converges, merges or is added, make sure in time that there is a big enough gap in the traffic to merge with the traffic. Also yield to other traffic, which might merge.

Source: Signs manual GS301, GS302, GS306, GS305