While it's true that distributing the load over more hours will improve things in the short term, the fact is, with continuous growth, eventually the roads/rout

While it's true that distributing the load over more hours will improve things in the short term, the fact is, with continuous growth, eventually the roads/routes need some improving. The simple fact is that in most cities, the road infrastructure is just not up to the task for the number of people using it, and projects rarely seem to include the future requirements of the roads based on growth. The other part of the problem, as I see it, is that the solution is almost always more lanes, rather than a highway that parallels the original a few miles to the left or right of the original route. More routes have the benefit of not bringing all traffic to a halt when one has an accident.