If you can't think outside the tunnel, why would ever bury yourself inside with rocks? This tunnel is LIT. (pun intended)
Why are the traffic lights not timed? And why is the carpool lane often empty, squeezing everyone in? Is is sustainable to have everyone idling for hours?
Build a bridge above the existing one. Use the existing one as structural support until the one above it is finished. Shouldn't take that much time or money, as long as we start now.
Cut down a few feet of the barricade and put in a timed traffic light. Keep things moving. Add a third access point through Aurora. Denny & Mercer are NOT enough.
Path to nowhere! Keep only the ones that are heavily used and actually have a barricade protecting the bikers. It's like they started making them, then got confused, then just stopped.
If people could afford to live here, they wouldn't have to commute to work. The more you sell and develop, the more you push people out. Forcing them to commute but expecting them not to drive. This isn't New York.