BentMikey said:
50cm is way too submissive, it's not even secondary position. IIRC cyclecraft specifies a minimum of 60cm, and even that is further left than would be normal.
Cycling isn't nearly that dangerous you know.
This is where differing experiences everyone has shows.
Granted 500mm is the minimum cyclecraft recommend..but it is still an acceptable distance, or cyclecraft wouldnt suggest it. I cope perfectly well with that distance, maintain a good line, am confident in traffic, and on most roads, in normal traffic conditions...i dont have problems. Traffic passes quite freely...i am far enough from the kerb to be in control.
Secondary position....500mm does come within the boundaries of secondary as written in cyclecraft.
I simply found that i can cope quite admirably 500mm from the kerb...this opens up the road to other users, and i could argue, actually its safer in some situations. An example...
I frequently find that some drivers when overtaking you are very reluctant to go over the white lines, into the opposing lane....even though there's NOTHING in sight

What are they thinking ?....an invisible car may be approaching ? ( never did understand drivers logic in that respect )
So...if hes going to stay in lane and overtake (which my experience show they frequently do)...being slightly closer to the kerb is actually safer. More room for the occasional moran to get past.
At this point you'll say
'ah well, if you maintained a 'proper' secondary, he wouldnt be able to get past'...but the morons still do....and frequently did, until i changed my position to slightly, but still acceptably, closer to the kerb.
It'd be interesting to see how many of us have had such a close overtake as shown in the OPs video.
For me, it's been twice.
The worst was when i sensed a car coming behind me on a narrow country road. there's an oncoming car as well, so the potentail danger is obvious. I assumed primary..and the b'stard still squeezed through an impossible small gap...probably smaller the the OPs video. Incredibly close...he must have been millimetres from me

The second one reinforces what i was talking about previously. Open road, i'm roughly in secondary...no oncoming traffic, all the room in the world...and a 4WD and caravan overtook close enough to scare the crap out of me....like he didnt dare use the other lane. WHY ????
Primary wont always help you, secondary wont always help you. What chance have you got when you come across these morons.