Take a tour of the world's biggest truck stop

Drivers moving west across Interstate 80 into Iowa experience the first undulations in terrain felt since Pennsylvania.

At night, numbed from hours on the road, its easy to confuse the sensation with flying.

Less than ten miles after crossing the Mississippi River - which marks the border between Illinois and Iowa - a red sign along the highway owns the dark abyss of a Midwestern horizon.

"Iowa 80" it says, and it's the world's largest truck stop.

It's also an unexpected vision into a subculture unknown to most, but familiar to the particular kind of people that for their living pull things across a very, very big country.