[bsder]

As I commented elsewhere, passing is not always an option in Pittsburgh.

> Pittsburgh, however, as an unusual misfeature in that the single bus lane goes the wrong way against one way traffic (3 lanes of cars going one way--1 lane of bus going the opposite) for a non-trivial amount of length flagged as "hotspots".

[arendtio]

It doesn't have to be always an option. The bunch is moving so it is enough if every third stop offers an overtaking opportunity.

But yes, that going against the flow doesn't make overtakings any easier.