[wybo]

If you take the terms technically, it is private mass-transit. However, considering its function, it does cut directly into the market for public transport (that already is difficult in many US cities due to lower density and more car-use). The terms don't matter that much (except for politically perhaps).

As for solving traffic problems, they don't necessarily do this more so than public transport would, if Googlers took that.

I think the issue is more that MUNI might have to think about introducing first-class busses, or first-class sections, or something like that. Because many people don't like sharing a bus bench with smelly (homeless) people.