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This comment worries me a little. Actually, more than a little. While I agree in a perfect world all motorists would drive in a way that a cyclist's use of a rear light would be irrelevant, that's not how it is in reality. Surely any little thing we can add to the mix that might help avoid us being another statistic is worthwhile? Until (as if ever!) we live in that perfect world, part of the onus remains on us to make ourselves as visible as possible. Even if it is unlikely that a car will be on the same road.
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BTW, to my surprise I did not hear much (if any) complaint about the requirement that LEL riders wear an ankle band.
I agree that we should make ourselves as visible as possible; but at the same time we need to be careful not to get onto the neverending cycle of increasing our visibility (lights/reflectors/hi-viz) against that of the motorist (with ever increasing light brightness and lack of attention).
By objecting to hi-viz/etc I'd hope to lob the ball back into the motorist's court and get them to learn to drive properly. When was the last hi-viz car you saw?
IMHO, based also on experience, black clothing with tiny reflective piping coupled with decent bike lights is just as visible as a cyclist in full hi-viz costume. To become more visible you need to position the bike sensibly*so that you are identified by the other road users.
As for LEL - I wasn't planning on taking part and hadn't spotted the reference to an ankle band. If I had I would have commented adversely. The PBP reflective lark was one of the reasons I didn't take part (I hate how hi-viz vests flutter over my normal cycle clothing) so the same criteria would have applied to LEL. On the plus side though the ankle band does at least imply "cyclist" and isn't as uncomfortable to wear.
* on the motorbike on Friday I managed to get spotted in another biker's mirrors so he pulled over to let us filter past, even though the rider ahead of me had been tailgating him for ages. I put the bike in a sensible place, the other rider hadn't.