my little old town does not have a bus service except dial a bus and a senior citizens bus, but the two nearest towns that have bus service I have found that those bus drivers are very good with bicycles

calling in can make a difference to a company. for instance I had on my commute a log truck that would always pass way to near, even with no oncoming traffic. It was the same driver, same truck. Finally one day I called to the company and was polite and asked them if they could remind the driver of the bike passing rule in our state.
Since then when he comes near, or anyone in the yellow log trucks, they give me plenty of space. One we pass almost every day that I commute and in the afternoons, I am facing him ( on other side of street) and he started waving, now we both wave at each other, maybe he is really flipping me off, I don't know.

Like I said , our state has the bike passing law,
and I have had cars pass me in rural areas with only inches to spare, no on coming traffic, and a state or sheriff behind them, and nothing happens to the driver.
yet one time in town , with the local cops, I have seen a cop pull someone over that was way to near on passing me
I am fortunate, I live in a small town, bike friendly roads, and bike friendly city cops