What does a traffic sign that is blue signal?

A traffic sign that is blue signals information regarding motorist services. Blue signs are used specifically to provide drivers with essential information about services available to them on the road. This includes signs that direct them to gas stations, hospitals, rest areas, and other facilities that are useful for travelers.

The blue color is standardized across the United States to help drivers easily recognize these important service-related signs amidst other colors used for different purposes. The focus of blue signs is on traveler assistance, making it clear to motorists where they can find support or resources during their journey.