What does a blue traffic sign usually indicate?

A blue traffic sign typically indicates services or amenities available ahead. These signs are used to provide information about essential services such as gas stations, rest areas, hospitals, accommodations, and food options. The blue color is specifically chosen to convey this information to motorists, allowing them to easily identify where they can find assistance or necessary facilities during their travels. This color association helps drivers make quick decisions about their needs while on the road, enhancing overall travel convenience and safety.