In terms of resources used to gain ratio that's terrible. Methods that reduce traffic density are much better than ones that increase it. And that's before you

In terms of resources used to gain ratio that's terrible. Methods that reduce traffic density are much better than ones that increase it. And that's before you think about what adding extra capacity does to a city. I've lived in quite a few cities in my time and the wider the roads in the city the worse the traffic, pollution and enjoyability of the city.