What does it mean if a traffic sign is blue?

A blue traffic sign universally signifies services that are available to drivers, such as gas stations, restaurants, and hotel accommodations. This color is used to provide important information that can assist motorists in finding necessary amenities during their travels. Blue signs are not typically used for regulatory or warning purposes—those are designated to different colors, like red for stop signs or yellow for cautionary signs. This helps drivers easily identify services and navigate more effectively.