CHICAGO, Aug. 1 (UPI) -- Commuters cruise down Interstate 95 from New York City to Washington, D.C., bumper to bumper, at a speed of 120 miles per hour -- about a two-hour trip at that speed. Do they worry about collisions? Not at all. They can even check the Dow Jones industrial average or browse new books on Amazon.com while they motor. By Gene Koprowski