Greetings

I recall a news item that said bus drivers received no acknowledgement from their passengers.  

Can't have been in this area, I expect that there are days the drivers here might like a bit of ignoring. Just about ever passenger getting on or alighting gives a greeting, morning, afternoon, how you doing...thank, ta, all right mate, cheers and many another variation.

I wonder if they get tired of responding or if it is a good part of an often difficult job.