What does the color red typically signify on a road sign?

Red is a color universally associated with the need for immediate attention and action, particularly in the context of road signs. When used on signage, red typically signifies a requirement to stop. This is why stop signs are painted in red, making them easily recognizable to drivers. The color's effectiveness lies in its high visibility and the instinctive response it invokes, which is essential for safety on the roads.

In contrast, colors like yellow might indicate the need to slow down, while other colors may provide gentle reminders for courteous behavior or caution. However, red's primary role is to communicate a clear and urgent instruction—namely, to stop—ensuring that drivers respond quickly to potentially hazardous situations.