I've been noticing how kids react when I say "good morning" on the bus. About half don't say anything back in the morning, but at drop-off, almost 3/4 say "thank you."
I tried an experiment - one morning I stayed quiet and didn't greet them first. Way fewer kids said "hi" on their own.
Happy kids almost always greet first and say "thank you" at the end - they smile and seem to enjoy it. Unhappy or stressed kids usually stay quiet, avoid eye contact, and sometimes don't say anything at all. Or maybe they just don’t like their driver :)
Even if they don't respond right away, I think that little morning greeting really matters. It helps them feel seen and ready for the day.