What is the main purpose of road signs?

The main purpose of road signs is to inform and guide drivers. Road signs serve as critical tools for communicating essential information to motorists, including traffic laws, hazards, directions, and other important instructions necessary for safe driving. They are strategically placed to enhance the overall safety of the road environment by alerting drivers to changes in conditions, such as upcoming intersections, speed limits, and potential hazards.

Without these informative signs, drivers might not be aware of critical rules, which could lead to dangerous situations. While aesthetics, advertising, or increasing speed may have some relevance in the broader context of road use, they do not align with the primary function of road signage, which is fundamentally about ensuring the safe and efficient movement of traffic.