What color are highway and expressway guide signs typically?

Highway and expressway guide signs are typically green with white letters. This color scheme is standardized to help drivers quickly recognize these signs as informative markers that assist with navigation and direction. Green signs specifically indicate directional guidance, providing information about route numbers, distances to destinations, highway exits, and other important travel-related details. This consistent use of green helps ensure that drivers can identify these signs at a glance, promoting safety and efficiency on the road.

Red signs are generally used for stop and prohibition signals, while blue is often reserved for informational signs related to services like gas stations and hospitals. Yellow signs usually indicate caution, warning drivers of potential hazards or changes in road conditions. Thus, the choice of green for guide signs serves a unique and practical purpose in the traffic sign system.