I'm pretty sure you missed the entire point of my comment. Basically with highly concentrated areas of work for people living in the sprawl that is greater LA,

I'm pretty sure you missed the entire point of my comment. Basically with highly concentrated areas of work for people living in the sprawl that is greater LA, the bigger gains are not in bigger roads, but in facilitating better flows in existing corridors. LA freeways have a lot of room for optimization, the big problem is always cost and lag in implementation. The above "anecdote" took 2+ years to be built. If you have never experienced 405 in West LA, I suggest you visit :)