After widening was completed in 2008, a portion of the highway west of Houston is now also believed to be the widest in the world, at 26 lanes when including feeders. - (Wikipedia)
Disused rail lines are a RoW life raft for American cities. I cycle in a very hilly area and rail trails and trails along waterways have nicely mild grades compared to the rest of the state. Electric trams could easily co-exist with a cycle path next to them. I just hope we're smart enough to recognize these chunks of land as a gift from the past and not give them up or develop them inappropriately (aka freeway expansions)
That sounds like extremely bad planning. In essence they could have had several smaller highways that better suited the needs of the users without forcing them all onto this clusterfuck.
There's already another highway 4 miles north and 4 miles south of it. There's some 2-lane each way roads between, but anything bigger or more grade-separated would be further isolate communities, take away alternative transportation routes, and take away greenspace.