Several years ago, where I live, a college student was riding his bike while listening to his Walkman, he was on the sidewalk, but ran into a train and got killed. Baracades were down for the cars, and the light was flashing. There wasn't any on the sidewalk right next to the street. I guess he was looking down, going to fast on his bike and boom, hit the train.
I inspected gas pipeline contractors and was inspecting a new line going in. There was a bike lane that he put up a "Men Working" large 4'x'4 sign orange sign in the bike lane. He was excavating right beside the bike land and had the lane closed. Guy on a bike ran into the sign. Tried to blame the contractor, but if the sign wasn't up, he would have rode right into a hole about 5' deep a few yards ahead. Oh, contractor also had a row of cones out, guy had to weave around to stay in the bike lane.
