A pennant shape sign mainly indicates what?

A pennant-shaped sign is specifically designed to indicate no passing zones. The triangular shape of the pennant is a distinctive feature that catches the attention of drivers and effectively communicates the message that overtaking other vehicles is not allowed in that area. This type of sign is typically placed on the left side of the road and is used in locations where it is dangerous to attempt to pass, such as curves or hills where visibility is limited.

Using a sign like this helps ensure the safety of all road users by preventing potential accidents that could occur from unsafe passing maneuvers. In contrast, other shapes and types of signs serve different purposes, such as stop signs, which are octagonal, or yield signs, which are triangular but oriented differently. Understanding the specific meanings of these various shapes helps drivers to respond appropriately to the road conditions and regulations.