In reply to angry pirate:
Thanks for a constructive comment. I don't typically reply to comments on videos like this - they go onto road.cc and representatives of every school of thought climb out and voice an opinion, many of which seem to relate to an entirely different video..
The trouble is that you see a snapshot of a lot of miles, with a cue that something is going to happen imminently. A bus and a bike braking together look as though nothing is happening. A car braking hard looks like the bike is surging into it without taking any action etc.
I think that that particular compilation covered about 700 miles over a bit less than a month. What you can't see is the context - what's behind etc, nor can you see the thousands of miles and hundreds of repetitions (>7,000 miles and >200 repetitions each way every year).
So, for example, I rarely cycle in the blue stripe going south though Tooting, except when there's a line of cars and my positioning then will vary according to the road and car layout.
Clapham Common northbound - never on the blue stripe, always in either the middle of the left hand lane, or middle of right hand lane, and travelling at about car speed. Going slower is a lot worse.
However, everything is always under review and what was good yesterday isn't today or tomorrow.