So you take out the intersection at 60 and Campbell. Now you can't get on or off the highway?

If you go underground you still have just as many connections you have to make to keep access, you've just inverted the problem, not fixed it.

Not to mention taking it all underground would be hundreds of millions. The existing bridge and existing infrastructure immediately around it alone is 50+ million worth.

All of that to say, every person in the city would need to pony up $1000-$2000 for that project.