In country areas in Luxembourg (and maybe other European countries) it is usual to thank the bus driver when you alight from the bus deep within the Luxembourg countryside.
A 'thank-you is well merited in Luxembourg as all public transport, trains, trams and buses, is completely free in that country. The idea was to try to reduce Luxembourg City's notorious rush-hour traffic jams by encouraging people to commute to work by public transport rather than by private car. To some extent, it has succeeded