It's not an option because we neglect it to the point it's not usable for a lot of trips.
That doesn't mean improvements aren't possible, and they would help free up capacity on the existing road network. Roads are such a poor investment at this point, especially ones like these
I know this is a hard concept to grasp, but there are people out there who are not yourself who, if the option is there, will leave their cars at home meaning the roads are less congested overall.