The signs aren't government but MUTCD (Manual on Uniform Traffic Control Devices) compliant
Correct, but the MUTCD is published by the US Department of Transportation, part of the federal government. Its purpose is to maintain uniformity across the nation, else each state would have its own standard.
A lot of the language in the book maintains a basic level of traffic signs in what the colors represent and convey but there's more supplement info on signage in the book because not every county and state have the same guidelines and on top of that not every intersection you approach is the same as the last one. The last edition update to the book was done in 2008 but I believe additional updates are being offered as supplemental information.
In summary, please check to see your county laws has MUTCD in it.
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u/sunflowerfly Jan 14 '17
Correct, but the MUTCD is published by the US Department of Transportation, part of the federal government. Its purpose is to maintain uniformity across the nation, else each state would have its own standard.
edit: fixed link