Compared to double-parked vehicles?
https://www.sfgate.com/crime/article/Motorist-in-Muni-tunnel...
https://sfist.com/2019/08/19/once-again-a-foolish-driver-dro...
https://www.ktvu.com/news/cars-drive-in-munis-sunset-tunnel-...
https://sf.streetsblog.org/2015/01/05/how-can-muni-stop-car-...
The SF MUNI system has light rail vehicles which do sometimes run on surface streets, similar to a trolley.
Self driving cars, on the other hand, are always courteous in my neighborhood, stop at stop signs, and never speed.