> Does this hold true for diesel trucks and buses and garbage trucks which are very common in cities?

I know from the hybrid buses in Boston that they are a massive reduction in noise for the passengers. When you're at a stop, it is great to not have that engine idling. Electric will only be better in that regard.

The garbage trucks though seem to make a shit load of brake noise though. And noise from trash dumping on top of trash and being compacted.