A yellow diamond sign showing a curved arrow indicates:

A yellow diamond warning sign with a curved arrow tells the driver that the road curves or turns ahead and that they should reduce speed and prepare to steer through it. A gentle bend may be shown as a 'curve' sign, while a sharper bend is shown as a 'turn' sign, sometimes with a suggested safe speed posted on a smaller plaque below. These advisory speeds are set for the curve and should be heeded, especially in poor weather or with a heavy vehicle. Recognizing curve and turn warning signs and slowing accordingly is important warning-sign knowledge.