> Your comments suggest someone who doesn't do a lot of cycling in traffic.
If that's what you got out of it then you're entirely wrong. I cycle a few thousand Km / year.
> Correct me if I'm wrong. You say that young or old cyclists will get 'clobbered' - what do you mean by this?
That the only way in which you can keep cyclists - of all ages - safe is by separating the various traffic streams. By forcible mixing them you are simply asking for trouble.
I'm trying hard to imagine Amsterdam cycling traffic without the separation of low speed and high speed traffic into different lanes and with people cycling like suggested above. The carnage would be terrible.
> That a car approaching from the rear will see them riding assertively and simply plow in to them?
Accidents are called accidents for a reason. That car approaching them from behind may not see them at all due to some momentary distraction. You can attempt to make yourself 'large' and 'visible' but you may still be missed and given the relative difference in strength and weight the outcome is predictable. The best way to stay safe as a cyclist is to stay out of the way of faster and heavy traffic.
> That the cars will pass them closely as they are forced to move further in to the other lane?
There may not even be another lane. And a fairly large number of motorists will not see that as a huge obstacle in trying to pass a cyclist that occupies a whole lane.
> If that's your assertion then as others have stated, an assertive lane position is exactly what will save you in this situation - as you have the room on the inside to avoid the passing car.
Well, in that case you didn't need to take up more room than you needed in the first place...
It's kind of weird how all this seems to center around having a 'safe' place to go to in case the assertive driving ('brave' was the word, why is it considered 'brave' if all it is is safe?) policy fails.
Better to recognize your fragility and play it safe from the get go.