Public transportation staff are a combination of <a href="http://www.shanghaiist.com/archives/2006/09/04/tipping_in_shan.php#comment-337786" title="Shanghaiist: Tipping in Shanghai: Do you? comment by Jakob">tough exterior and heart of gold</a>:

<quote>Hehe, I once tried to tip a bus driver. The bus was 2 RMB, but I only had a 5 RMB note. He had no change, but as soon as we arrived at the next stop, he got out of his seat, took some RMB from a guest who got on, walked all the way through the bus to me and gave me my three RMB back - that was so emberassing, since then I tip no more.</quote>