Of course, if such a thing were ever built, you'd wait so long in security and lines to pay off every mouth in the national security theater pork barrel trough that it'd have been faster to drive.<p>The best thing about driving in the USA is that oil companies, manufacturers, the UAW, the AAA, the AASHTO, and the rest have established a lobbying network that can blow down even the most sensible limits on driving. They whine like a toddler even at tiny inconveniences that would benefit them in the long run like raising the gas tax enough to keep highways and bridges from falling down. And the government bows and submits and the motorcar industry gets even steeper outrageous subsidies while high speed rail, public transit, and air travelers get whacked with a bat in the teeth. Usually it's the national security complex that wields the bat but it could just as easily be an overpaid transit union.