Bikes and cages mix but what I find sickly educational is the amount of colateral damage. What happens in the other lane doesn't stay in the other lane. What are you prepared for?
http://www.youtube.com/watch?feature=player_detailpage&v=iVSqOlNDF10
http://www.youtube.com/watch?feature=player_detailpage&v=iVSqOlNDF10