Final answer:
The road sign in question indicates that a road joins from the right, signaling drivers to be cautious of merging traffic from that direction.
Step-by-step explanation:
Interpreting road signs is an essential skill for drivers to navigate roads safely. If you come across a road sign that indicates a road joins from the right, it means that there is an intersection where another road will be merging into your lane or pathway from the right-hand side. This sign is a cautionary indicator for drivers to be aware of potential vehicles entering the road from the right and to be prepared for possible merging traffic.