In the United States, green is normally used for guide signs showing destinations, routes, and distances.
Green guide signs help drivers navigate rather than warn them about hazards or order them to perform a specific action. They may list street names, towns, highway exits, route directions, mileage, or destinations reached from an interchange. White lettering and symbols provide the usual contrast.
This convention is distinct from other major sign categories in the United States. Yellow is associated with warnings, red with stopping or prohibition, orange with temporary traffic control, and blue with motorist services. Brown is commonly used for cultural, recreational, and scenic destinations.
The Federal Highway Administration’s Manual on Uniform Traffic Control Devices establishes national standards for traffic-control devices, although road agencies apply the signs to local routes and conditions. Green destination signs should not be confused with regulatory signs, which communicate legal requirements rather than navigation information.