Earlier quoted context omitted.
Crowded cyclists are much denser than crowded cars. http://www.bikehub.co.uk/wp-content/uploads/2012/09/Munster1...
That's a really shitty comparison. Unless cyclists really do drive in such packs (which they don't). In reality, the effective space taken by cyclist on genera purpose road is bigger than a car — you need a huge safety margin to overtake a cyclist, and if you cannot do that you a forced to follow them untill you can and that's really ineffective. All this does not apply to dedicated cyclist roads/lanes, of course.
> In reality, the effective space taken by cyclist on genera purpose road is bigger than a car — you need a huge safety margin to overtake a cyclis
More than a car? I've certainly not been given more space when people overtake me. Remember a car is 6 feet wide, that's quite a bit of space already that's taken up by a car.