Question

this sign means:
merging traffic is approaching from the right
winding road ahead
right lane ends ahead, stay to the left
divided highway ahead

Explanation:

The sign in the image is a traffic sign. Traffic signs are part of transportation regulations, which fall under the subfield of Construction Project Management in the Social Science discipline. This particular sign indicates that the right lane ends ahead, and drivers should stay to the left.

Answer:

Right lane ends ahead, stay to the left