Sure. if you don't care about the environment, are willing to pay more (for petrol) overall, have enough roads that everyone can have their own car, and can put

Sure. if you don't care about the environment, are willing to pay more (for petrol) overall, have enough roads that everyone can have their own car, and can put up with the inevitable congestion.... Although I'm sure the present-day 'business case' agrees with you, I don't think this means it is necessarily the right thing to do.