These two are intended for US Highways with Interstate characteristics, i.e., fully-controlled access with breakdown lanes, where possible. These two have the "modern" US Highway Sign shape outlined blue shield with with contrasting blue surround and differently-colored banner representing a fully controlled access expressway -- same as for Quebec's Autoroutes. The one with the red banner would be for freeways and the other would be for tollways.
I'd go with the red, white and blue color scheme on the US shields for motorway quality US routes. The color scheme would be equivalent to the A-xx M that the British use.
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