What does a yellow diamond sign with a black winding arrow mean?
Answer
Winding road ahead
A yellow diamond sign with a black winding arrow means a winding road is ahead.
In the US, this is the MUTCD W1-5 warning sign. It alerts drivers that the road will change direction repeatedly, typically through a series of curves in alternating directions. Drivers should reduce speed as appropriate and be prepared for the first curve and the ones that follow.
The sign is different from a single curve or turn warning. A single curved arrow describes one major change in alignment, while the winding-road symbol summarizes several successive bends. The arrow’s first bend also shows whether the road initially curves left or right.
Under US traffic-control guidance, a W1-5 sign may be used where there are three or more alignment changes relatively close together. The yellow background marks it as a warning sign, while the diamond shape distinguishes it from regulatory signs such as speed limits or stop signs.