As a cyclist myself, it would be great to get more information on this. Was the
slack line somewhere it should not have been, particularly on a street?
I'm always paranoid about this type of thing when I pick up speed, mainly
concerned about somebody's practical joke gone wrong. I've heard of
this with motorcycles.
Slacklines should be required to have markers on them such as plastic balls so
that they are easily visible.
Was the line across the street?How sad. I sure hope people are more
careful in the future.