Originally posted by WPRESTO We drove along a roadway somewhere inland in Alabama/Louisiana that was elevated on pillars causeway-like a substantial distance above ground that apparently is prone to flooding (no water when we drove it). Must have taken 30~45 minutes to do the whole of it with no place to pull off or turn off, no sign of buildings or roads on the ground below as l recall. It was ramrod straight. I'd almost trust a self-driving car on it. Sorry I cannot remember the name of the highway. We were there back in the 90's (film-era, remember that time?).
I've been across that one too.
Actually, in the swamp states there are a lot of causeway bridge highways. Some are US or state routes, and others on interstates. I-10 in Alabama and Louisiana. I-65 across Mifflin Lake in Alabama.Much of I-50 between Memphis and Little Rock is elevated. I-20 from just West of Vicksburg, MS to Monroe, LA has a long elevated stretch too.
The Chesapeake Bay Bridge/Tunnel, US-13, 23 miles long.
Then there is US-1 through the Florida Keys.