The Lost Highway is a four-lane mile-long string of cars caught in a timeless and eternal traffic jam. It’s only part of the Car Garden, a sprawling collection of automotive vignettes and arrangements of motor vehicles somewhere in southern California. Exactly where is a closely-guarded secret because the artist doesn’t want the likes of you and me clomping around on his work-in-progress.
The simple and clear summation can be found at Tom Vanderbilt’s blog.
A far more detailed account can be found at Car and Driver.