Imagine if all painted infrastructure did this haha.

Right at the end there it shows a side effect of this installation that by itself is useful in bringing the cars to a reasonable speed when approaching the crosswalk every time, not just when there's a pedestrian: the crossing is raised.

Off the top of my head I can't remember how common raised crossings are in Montréal, but they are effective. This demonstration is quite fun though, I was expecting a bunch of body guards to pop out and create a wall across the roadway and the instant fence caught me off guard.