What is the primary purpose of road signs that are colored yellow?

Road signs that are colored yellow primarily serve to warn drivers of potential hazards or changing conditions on the roadway. Yellow signs are often used to alert motorists to situations that may require increased caution, such as curves, intersections, pedestrian crossings, or road work. They are designed to catch the driver's attention and communicate important safety information quickly and effectively, ensuring that drivers are prepared to react appropriately to potential dangers.

Regulatory signs, which convey rules that must be obeyed, are typically in colors like red or white. Information about routes, such as directional signs, commonly use green, while services available to drivers, like gas stations or rest areas, are often indicated by blue signs. In contrast, the bright yellow color is specifically intended to highlight warnings, making it essential for driver awareness and safety on the roads.