Semi relevant: New York City advises you to &quot;tip your driver for safety and good service&quot; [1].  Kinda scary that safety is some optional thing that you do for the prospect of a passenger noticing it and paying you more...<p>[1] <a href="http:&#x2F;&#x2F;www.nyc.gov&#x2F;html&#x2F;tlc&#x2F;html&#x2F;passenger&#x2F;taxicab_rate.shtml" rel="nofollow">http:&#x2F;&#x2F;www.nyc.gov&#x2F;html&#x2F;tlc&#x2F;html&#x2F;passenger&#x2F;taxicab_rate.shtm...</a>