AlanOfTheBerg wrote: Because there is zero effect between major and minor on routing, I see it as a really minor thing and use it to visually separate, quickly (with color, sorry color-blind folks) state routes from US routes from interstates. I see little reason, currently, for spending a lot of brain time on the merits of the various opinions any longer. We've spent so much time and never come to a satisfactory conclusion.
Thanks for this, I will follow suit. I found out today the same zero effect on routing occurs with Street and Primary Street. I am going to adapt the US Hwy as a major highway also.