Interesting to see how ambitious some states were for '68 compared to others. One can see how some places saw the additional mileage as their way to get 'their fair share' of the pie. And in general, there seemed to be a strategy of throwing a bunch of ideas at the wall to see if any stick.
I do have to laugh at some of the pitches by states; the New Hampshire ones in particular. I find it weird they didn't pitch the NH 101 corridor from Manchester to the coast as an interstate in that map, but had these other lines drawn through a lot of nowheresvilles.
I also have to chuckle at Michigan's idea for not one, but two UP interstates.
Menomonee to Marquette; I doubt it would have changed the outcome, but I wonder if a stronger case would have been made if they could have collaborated with Wisconsin on that so it actually continues down to Green Bay and beyond.
Interesting to find out Wisconsin pitched two of the unbuilt Milwaukee area freeways as interstates. Makes me wonder what 3dis they could have been. I also wonder what they were thinking regarding the "Green Bay Loop Freeway" in the context of their first pitch for I-43. If I'm remembering correctly, Wisconsin actually got rejected for I-43 in '68 because they screwed up the paperwork. They had to wait until 1972 to get the Milwaukee-Green Bay interstate awarded.
Texas' idea for non-fully access controlled interstates is interesting since that's pretty much what they did with some stretches of I-40 and I-10. After all, in the 50's the idea was the interstates would go down to just two lanes when it got too sparse. But we all know what happened instead. Probably for the better, in the long run, because the appetite for adding lanes to some rural interstates out west probably would have not materialized. I think about I-15 north of Great Falls or I-70 through the San Rafael Swell. With the latter example, it was definitely the fiscally sound decision to build that as a four lane divided facility right from the get-go. If they had to go back and try and add the other carriageway in like the 80's or 90's; yikes.