What type of road sign provides information about upcoming exits?

Guide signs are specifically designed to provide information about routes, directions, and services. They help drivers navigate by indicating upcoming exits, services available, and distance to destinations. This is particularly useful for drivers who may be unfamiliar with the area or are seeking specific services like fuel, food, or lodging.

In contrast, warning signs inform drivers about potential hazards or changes in the road conditions ahead, such as curves or road work. Regulatory signs, on the other hand, convey laws and regulations that must be followed, like speed limits or stop signs. Informational signs generally provide helpful information but do not focus specifically on route guidance. Thus, guide signs are the correct type of sign for alerting drivers about upcoming exits.