A speed restriction sign:

Curve and turn warning signs often have attached advisory speed signs that show a recommended driving speed for drivers in the curves and turns. Although a driver may feel comfortable driving at a higher speed in fair weather, they should never do so under rainy, snowy, or icy conditions.

• May be ignored in rainy, snowy, or icy conditions.
• Has a triangular shape.
• Is blue with black lettering.
• Shows a recommended speed for a curve or turn.