I have been playing a bit with that. Keeping the capacity down while increasing speeds may be the answer. I still have a bit of experimenting to do, decreasing the capacity will raise commute times a little, but will also get the red roads back that comm likes. I am still trying to find the "perfect" combination. I like it to remain somewhat realistic, so I am trying not to get 100mph speeds on roads. Right now my commute times range from 60-130 minutes in a region of about 15 cities and just over 1 million population.