Which traffic sign shape serves as a warning to drivers about passing behavior on the left?

The pennant-shaped traffic sign, often seen in the context of warning signs, specifically indicates that passing on the left is prohibited. This triangular shape, which is typically oriented with the pointed end facing down, serves a clear purpose in alerting drivers to potential hazards associated with passing maneuvers.

The design of the pennant shape is strategic; its placement on the road informs drivers to be cautious and aware of the signals regarding passing. It is usually positioned in locations where passing might be dangerous, such as on curves or hills where visibility is limited.

In contrast, three-sided signs generally indicate yield instructions, brown signs are associated with recreational and cultural interest information, and rectangular signs tend to provide information such as regulatory guidance or informational alerts. Understanding the specific meanings associated with different shapes of traffic signs helps ensure safer navigation on the roads.