The use of red on signs is limited to stop, yield, and prohibition signs.
A white background indicates a regulatory sign;
yellow conveys a general warning message;
green shows permitted traffic movements or directional guidance;
fluorescent yellow/green indicates pedestrian crossings and school zones;
orange is used for warning and guidance in roadway work zones;
coral is used for incident management signs;
blue indicates road user services, tourist information, and evacuation routes;
and brown is for guidance to sites of public recreation or cultural interest.
Anything from upcoming ammenities to what radio station you should tune to for information during evacuations (hurricane evacuation routes have these regularly)
Actual answer for anyone curious: In the US, most public points of interest are marked by brown signs (parks, libraries, zoos, historical sites, etc.)
And “traveler facilities” are blue, right? Camping, gas/food/lodging, hospital, rest areas?
I’m trying to remember what I see every day now… I’m sure hospitals and the signs for food/lodging are blue. Maybe airports and train stations too?
When I picture signs for camp grounds, I imagine them as brown, but I could be wrong.
https://mutcd.fhwa.dot.gov/services/publications/fhwaop02084/index.htm
Why bother remembering when you can just look it up in the MUTCD?
Blue is just “informational”
Anything from upcoming ammenities to what radio station you should tune to for information during evacuations (hurricane evacuation routes have these regularly)
Ohhh so that’s why “info” type components (toasts, modals, divs, whatever) are styled in blue for every CSS bootstrapping kit.