[VancouverOfTheFuture]

with regards to crossing gates, you'd be surprised how often they get hit and driven through and then they end up in the way of traffic and the rail tracks. they are easy to remount because they are designed to pop-off when hit, but it causes a maintenance issue as well as delaying the train which needs to stop and have the thing moved out of the way. plus, pedestrians routinely walk under, around, over crossing gates already on the various lines around the city. hell, people even climb, with their bikes, over the slow moving trains on the Burrard Inlet rail line.