What does the color blue signify on traffic signs?

The color blue on traffic signs primarily indicates road user services, tourist information, and evacuation routes. This color is used to guide drivers towards amenities and services that are helpful during travel, such as motels, gas stations, campgrounds, and points of interest. Additionally, blue is often associated with emergency evacuation route signage, ensuring that motorists can easily identify safe paths during emergencies. This systematic use of blue helps create a consistent wayfinding experience for travelers, ensuring they can access crucial information without confusion.