It's not transformative. It does absolutely nothing to fix traffic/congestion. Because the real limitation is above ground where streets where people are being

It's not transformative. It does absolutely nothing to fix traffic/congestion. Because the real limitation is above ground where streets where people are being dropped off/parking/living/etc which have limited capacity and cascade into backups from local streets and onto highways. This just means there'll be back ups underground as well. Unless people are going to start living underground. Then you start to remove the above ground choke points ;)