What is the primary function of guide signs on highways?

Answer: B — To provide navigation assistance

The primary function of guide signs on highways is to provide navigation assistance. These signs are designed to help drivers find their way by giving information about directions, distances to destinations, and the locations of important services. This can include details about upcoming exits, highway names, and connections to other major roads or highways. The clarity and visibility of guide signs are essential for ensuring that drivers can navigate effectively and safely while traveling. In contrast, warning signs serve a different purpose by alerting drivers to potential hazards ahead, speed limit signs regulate the maximum allowable speed, and specific signs indicate the locations of rest areas. Each of these types serves an essential function on the road, but guide signs are specifically focused on route navigation.