What type of information does a blue informational sign provide?

A blue informational sign specifically provides details about services available to travelers, including gas stations, hospitals, food, lodging, and other amenities. Such signs are designed to assist drivers in finding essential services along their route, making them critical for road safety and convenience, especially in unfamiliar areas.

Other types of signs serve different purposes: regulatory signs communicate laws such as speed limits, warning signs alert drivers to hazards like road construction, and guide signs often direct drivers to cities or points of interest. In contrast, the blue informational signs cater specifically to the need for service information, which is why choosing the answer that indicates details about services is correct.