No Passing Zone
This pennant-shaped yellow and black traffic sign marks the beginning of a no passing zone. The sign is placed on the left side of the road, facing the driver. You may not pass cars ahead of you in your lane. If you started passing another vehicle and you see the sign up ahead on the road, you must complete passing before you enter the no passing zone.
Most commonly, the "no passing zone" traffic sign is installed before hills or curves where you cannot see far enough ahead to pass safely. The sign is usually reinforced by pavement markings, you will see a solid yellow line on your side of the road throughout the whole area controlled by the sign.