Membrane
On the bridge itself (where the actual overtake took place) there was IMO no reason for Magnatom to be in the primary position (no risk of being door'ed (no parked cars there), the other cyclist was still too far ahead).
I have to disagree here, the nature of the bridge itself was the hazard which warrented primary. If the driver were to have overtaken on it, he would have been forced to squeeze Magnatom as the video shows 3 cars crest the bridge before Magnatom clears it himself.
Unfortunately Mr Muppet couldn't wait to get past.
I have thought a lot about why drivers feel that cyclists are in the way, and have come to the conclusion that it is basically an extension of the motorway effect - whereby the brain adapts to processing what what the eyes are seeing at a certain speed by narrowing the picture profile (the active part of the drivers vision, what they react to), basically a tunnel vision effect.
When the vehicle suddenly slows down the brain is not able to instantly widen the picture profile, it needs to work out how much more information it can take it before doing it. This leads to the sense that the vehicle is travelling much slower that it actually is, due to the picture profile being too narrow. Too much information is excluded from anaylsis, in a way it is giving the brain too long to look at the environment, creating a distorted sense of speed as not enough changes / is happening.
I believe this to be the primary reason that drivers get so upset when they have to wait behind a cyclist, or even a much slower driver. Below I have put together a very rough example of how crazy it is to get so aggrivated.
In Magnatom's clip the car would have been behind him for a
maximum of 32 seconds until it was back in the lane infront of Magnatom (basically when he finishes saying "A$$hole").
32 seconds.
That is 1.19% of the average car commute time in the UK* spent at a
slightly lower speed.
A big enough deal to beep? A big enough deal to shout abuse about? A big enough deal to endager someone's life?
I think not.
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* Average commute time in the UK in 2003 was 45mins
Source
BBC, "UK commute 'longest in Europe'", 2003, [Online] Available from:
http://news.bbc.co.uk/1/hi/uk/3085647.stm