No, it's because your answer is overly simplistic. We don't build one lane roads, we tend to build 3 or 4 in each direction, at least in cities.

Also, leave a road alone, it does not just sit there. In cold climates you get frost heaves, in hot climates asphalt is never truly "solid" so it gets ruts... water causes damage, plants grow through it...

Add in some of the other responses and we have a more complete picture. I'm not convinced. At best it might be a wash.

*edit* just realized you're not the same person, sorry. My point still stands though.