>
>   > secondary in most cases for the state
> highways and primary for the US ones.
>

 At least for the U.S., the Interstate vs. State Route distinction has more
to do with funding than  carrying capacity and physical attributes. We have
several State Routes that are definitely expressways:
https://www.windy.com/-Webcams/United-States/Washington/Seattle/SR-at-MP-:-Des-Moines-Memorial-Dr/webcams/1459260132?47.545,-122.306,13

Although they are few, there are still portions of the Interstate that are
not expressways:
https://en.wikipedia.org/wiki/List_of_gaps_in_Interstate_Highways#Undivided_and_narrow_freeways

Michael Patrick
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