What is the primary purpose of blue signs?

The primary purpose of blue signs is to provide service information. These signs are commonly used to direct drivers to various facilities and services, such as gas stations, rest areas, hospitals, and restaurants. This color coding helps to easily identify important services that can assist travelers on the road, especially in unfamiliar areas.

Signs indicating a stop requirement typically use red and white colors, while speed limits are indicated with regulatory white signs that often have black numbers. Hazard warnings are depicted with yellow or fluorescent yellow-green signs to alert drivers about potential dangers ahead. By understanding the function of blue signs as service indicators, drivers can better navigate and make informed decisions during their travels.