What type of traffic sign is used to indicate a no passing zone?

The correct response highlights that the pennant-shaped sign is specifically used to indicate a no passing zone. This shape is distinctive and easily recognizable, allowing drivers to quickly identify areas where overtaking is prohibited to enhance safety on the road.

The pennant sign typically features a yellow background with black lettering or imagery, alerting drivers to the potential hazards associated with passing at that location. It is strategically placed to give a clear and early warning to drivers, allowing them to adjust their behavior accordingly.

In contrast, while circular signs often signify regulatory or warning information related to traffic control, rectangular signs provide general informational notices. The diamond shape is typically reserved for warning signs that suggest caution without specifically prohibiting actions such as passing. Thus, the unique function of the pennant shape in conveying the no passing zone is crucial for maintaining road safety.