Question: What is the difference between green highway signs and blue highway signs?

There are several colors of signs that are used on the city streets, county roads, state highways, and interstate highways throughout the US (Canada and Europe will be somewhat different, but will still have their own color codes per country).

So, rather than give you a simple answer, as usual, I’ll give you a complex answer to a simple question. Actually, I’ll give you a color coded answer with visuals so you’ll have a good understanding of how highway,