And some places even run smaller buses. Here in the DC area, we have articulated buses, standard ones, and even smaller ones—about 60 percent of the size of a standard bus. It's rare to get the ideal size at the right time in an area of such bad traffic, but they do make an attempt.

In the small city I live in, we have small buses, which is sized right for the ridership. Unfortunately their top speed is about 26MPH on level ground and My commute includes a steep freeway overpass, which that drops to about 18MPH. The speed limit on that stretch of road is 25MPH and most traffic goes about 35MPH on the overpass as there is nowhere for a speed trap to be set. I can tell from 4 blocks away when one of those buses has been there recently.

London used to have them. It was sort of amusing watching them trying to navigate the tight corners and narrow streets. But very scary to be near them on a bike.