That doesn't exactly improve the ROI.
From the perspective of the city, the ROI of a subway train is high.
From the perspective of an individual, the ROI of using my own car in a tunnel, exactly when I want to, without parking, waiting, embarking, smelling the vagrants, disembarking, walking or getting a cab, ... Priceless!
My corrections in CAPS.
I don't think I need to say more, it should be obvious way tunnels for cars are a bad idea.
What about everyone else and their cars?
Weird then that he didn't ask the individual to pay for it.
Because if you keep downvoting every statement that you don’t agree with, that’s what you’ll soon have!