> 2a. What is the least crossed state border?
>
> After some cursory analysis of the continental U.S., I wonder if it's the border between Oklahoma and New Mexico. Only one major road crosses the border, and the only cities it really connects are Topeka, Kansas, and Santa Fe, New Mexico, neither of which are particularly large. If it's not THE least crossed state border, it must be in the bottom five or so. Any other candidates?

I would suggest the border between California and Hawaii. On Sept. 12, 13 and 14, almost no one traveled between those two states. I suppose the same could be said for Washington and Alaska.

As for national boundaries, I heard a story about some people who opened a bar (nightclub? speakeasy?) on the US-canadian border during prohibition. The bar was at the Canadian end of the building, the restrooms were in the U.S. and asmall dancefloor was in between with the border running right down the middle. With all that dancing and trips to the restrooms, there was a great deal of border crossing every night.
How"I don't 'splain 'em, I just tell 'em"ard