Back Door = Busdriver Urinal?

Here's a weird story from Randy, I want to believe this is real, but either way it's a great story!:

My Father now deceased retired from Winnipeg Transit in the 80s but he left us with some hilarious stories. Here's one of them. He said on some routes there were no bathroom facilities for the drivers and at the end of the route they would open the back door slightly and relieve themselves from the steps when there were no passengers on the bus of course. As the story goes my Dad peed out the back door one evening and went back to the driver's seat. After he was settled a well dressed lady got on the bus rubbing her wet left shoulder and told my Dad he should check his bus because liquid was leaking from the side by the back door and she got sprayed when she walked by. Of course my Dad knew what had happened but he got off the bus to check the situation and came back to tell the lady he could not see anything wrong. He then proceeded to take the lady to her destination probably smiling all the way.