What feature typically designates a no passing zone?

A no passing zone is typically designated by a pennant-shaped sign. This type of sign is specifically designed to alert drivers that they are entering an area where overtaking and passing other vehicles is not allowed. The pennant shape — which is essentially a triangular sign pointed to the side — is standardized for this purpose and is easily recognizable for its function.

The clarity of this sign helps drivers understand the rules of the road and contributes to safer driving conditions by discouraging overtaking in areas where it could be dangerous, such as curves or hills with limited visibility. Recognizing and obeying these signs is crucial for maintaining road safety.

Other options like solid white lines may indicate areas where passing is discouraged but are not sole indicators of no passing zones. Diagonal stripes may serve different purposes in road marking, and circular yellow signs generally indicate caution but do not specifically denote no passing zones.