This road sign means:

Curve ahead, the recommended speed is 40 MPH or less.
Drive no less than 40 MPH around the curve ahead.
The speed limit after the curve ahead is 40 MPH.
Winding road ahead; slow down to the indicated safe speed.
Explanation

This sign warns drivers of a curve in the road ahead. The arrow indicates the direction of the curve, and the text "40 M.P.H." advises drivers of the recommended speed to safely navigate the curve. It is important to follow this advisory speed as the curve may be too sharp to negotiate at higher speeds. Excessive speed can cause loss of control, skidding or rollovers, and may lead to accidents.

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