Many more people travelling than normal on buses/trams which would be crowded on a regular day.
Where i live now the various bus companies have weekly tickets that basically enable people to take many short trips at no extra cost instead of walking. I'm talking about small distances here of less than one mile.
My experience is that when you offer something for no cost you soon become overwhelmed by the numbers of people who'll find any way they can to take advantage of it.
