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If you're curious, Forest Service signs are specified by Sign and Poster Guidelines Engineering Manual EM7100-15 [1].

[1] http://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprd3810021...

That standard is incredible, I had a good flick through it just in awe of the level of specification that goes into signage, I love that type of stuff, it's a hidden world.

The British standards for road signs and markings are also online, and with much better typography :-)

https://www.gov.uk/government/publications/traffic-signs-man... (chapter 7 is best, for kerning rules, and making and face the right way).

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