This sign means:

This sign alerts you to the possibility of traffic merging into the main stream of travel. After checking to your side and rear, you should move into another lane, if possible, to allow merging motorists a clear path.

• You should stop for other traffic.
• Traffic is entering from another road and you should allow additional space for drivers to merge safely into the flow of traffic.
• Traffic is entering from another road and you should keep right.