The only thing that should change from one state to the next is the way that state handles its own state highway system (and possibly county routes). By default, all state highways are mH or higher. Some states which have both primary and secondary state highways may wish to demote the secondary state highways into the "State Hwy BUS, SPUR[a], LOOP" column. Some states don't have county routes at all; some states have "county highways" and "county roads" and may wish to make the former mH+ and the latter just Street+.
But the bulk of the guidance remains the same — nothing major changes in FC, except that some states might just use the "Other Freeway" class (as opposed to "Other Freeways and Expressways"), thereby placing all partially-limited-access 'expressways' into the "Other Principal Arterial" class. Michigan does this, for example. That doesn't actually change any FC rule, it simply makes the distinction easier for us in that state. Also, the guidance as to US highways remains the same.
So it isn't really necessary for all 50 states to supplement the FC guidance, as some will not need to change any of the state highway rules at all. If anything, making a state chart should only involve renaming some column headers to match that state's maps and maybe removing a column or row or two if they don't apply. For example, Michigan does not have "Other Expressway", and calls the next two classes "Other Principal Arterial" and "Minor Arterial"; Louisiana has "Freeways/Expressways" and "Principal Arterial" and "Minor Arterial", and "Parish Roads" (not county routes), no Interstate business routes, no CONN or ALT (I think) state highways, and so forth.
But the bulk of the guidance remains the same — nothing major changes in FC, except that some states might just use the "Other Freeway" class (as opposed to "Other Freeways and Expressways"), thereby placing all partially-limited-access 'expressways' into the "Other Principal Arterial" class. Michigan does this, for example. That doesn't actually change any FC rule, it simply makes the distinction easier for us in that state. Also, the guidance as to US highways remains the same.
So it isn't really necessary for all 50 states to supplement the FC guidance, as some will not need to change any of the state highway rules at all. If anything, making a state chart should only involve renaming some column headers to match that state's maps and maybe removing a column or row or two if they don't apply. For example, Michigan does not have "Other Expressway", and calls the next two classes "Other Principal Arterial" and "Minor Arterial"; Louisiana has "Freeways/Expressways" and "Principal Arterial" and "Minor Arterial", and "Parish Roads" (not county routes), no Interstate business routes, no CONN or ALT (I think) state highways, and so forth.
Re: Road Types (USA) – comprehensive overhaul of drivable ro