Yeah, they fail to realize, in order for busses to adquitely service the population, you have to have dozens of busses running on each buss line. Plus, busses slow down city traffic horrendously because they are not fast movers to begin with, and they have to stop at each city block. If you ever get caught behind a bus in the mild of down town traffic, you know what a pain in the but that is.
Just removing the busses from city traffic will free up lots of road way, and keep the flow of traffic moving.
Besides that, it really doesn't solve the traffic problem anyway, because as people use mass transit, the reduction in traffic causes more people to drive. Ultimately the amount of traffic remains roughly the same, no matter how many start using busses for their daily commute.
Think about it, which cities use the most mass transit? Now, which cities are known for the worst traffic? Often it's the same cities. New York, L.A., Chicago, and so on.
But government was never about results. It was about dependence. If you don't have a car, and become dependent on public transportation, what does that make you? Potential voters who is interested in who's going to keep and expand public transportation. Not to mention the payoff from corporations that benefit from tax money spent on public transportation.