This road sign means:

These signs indicate that the road curves to the right ahead and that drivers should slow down to the safe speed indicated (in this case, 35 mph).

• The road ahead curves right. Slow down to the safe speed indicated.
• Divided highway begins. Slow down to the safe speed indicated.
• Merge. Slow down to the safe speed indicated.
• Winding road ahead. Slow down to the safe speed indicated.