>>We couldn't leave a project like the highway system in the hands of a private corporation.

I have to completely disagree with you, I believe you take too much on faith. We don't know what would've happened, but it's very possible that a better alternative could exist.

1. How much richer would everyone be if they were able to keep there tax dollars. 2. Without subsidizing cars, perhaps trains would still be a viable option. 3. Traffic may not be as much of a problem; maximum speeds would not be so ridiculously low. 4. We might see less urban sprawl.