Final answer:
The sign indicates that traffic is entering from another road and drivers should slow down or move into the left lane to allow the merging driver a clear path
Step-by-step explanation:
The sign you described indicates that traffic is entering from another road and drivers should slow down or move into the left lane (if possible) to allow the merging driver a clear path. This sign is commonly seen in areas where two roads merge together or where a lane is added to an existing road. By slowing down and giving way to the merging traffic, drivers can prevent accidents and ensure a smooth flow of traffic.