Those are cars abandoned during the evacuation of New Orleans for Hurricane Katrina. Lots of cars that were trapped in the evacuation traffic jams ran out gas and were left behind by there owners (I’m guessing these maybe some of those cars that ran out of fuel) These cars were for sure left in a area that had massive flooding, as you can see water marks left by the water. I assume they were originally left abandoned on the road-way, and road workers clearing out the roads simply pushed them under this overpass.

These cars were still there under Interstate Ten (I-10) as of 4/14/2006. I would assume that they have been taken to a junk yard by now, as they are all Write-Off's ...