What is the primary function of traffic signs with a yellow background?

Traffic signs with a yellow background primarily serve the purpose of warning drivers about potential hazards or to alert them to changes in road conditions ahead. These warning signs are essential for enhancing safety on the roads. They are designed to catch a driver's attention and indicate that there may be a need for caution due to situations such as sharp turns, pedestrian crossings, or road work.

Yellow is universally recognized as a color that denotes caution or alertness, making it a suitable choice for signs that inform drivers to reduce speed or prepare for an unexpected event. Understanding this helps drivers stay vigilant and respond appropriately to various road scenarios, thus contributing to safer driving conditions.

The other types of signs mentioned, such as stop signs, regulatory signs, and information signs, have distinct purposes and colors that differentiate them from warning signs.