Why is zoo in red 😳

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.