Does high visibility clothing affect passing clearance? Perhaps not.
From
https://www.theguardian.com/lifeandstyle/2017/mar/21/bike-helmet-cyclists-safe-urban-warfare-wheels
"In 2013 the tireless Ian Walker carried out a more extensive version of
his helmet study. It also measured how closely drivers passed a bike
when overtaking, but this time – using a volunteer colleague rather than
himself – there were seven different outfits. Four made the rider look
like a cyclist of varying experience and dedication, ranging from full
Lycra to more everyday clothes, including one involving a hi-vis jacket.
Three other outfits were based around bright yellow waistcoats bearing
written messages. One read, “Novice cyclist: please pass slowly”;
another said, “Polite: please slow down” – “polite” is sometimes used by
UK cyclists and horse riders in the hope drivers might mistake it for
“police” – and finally one read, “Police: camera cyclist”.
This brought data for just under 5,700 overtakes, more or less evenly
split between the seven outfits. None of the outfits made an appreciable
difference to driver behaviour, apart from the one saying “police”. For
the six others, the average passing distance was between about 114cm and
118cm. For “police” it went above 122cm. Similarly, the proportion of
drivers who went very near the bike was noticeably lower for the
“police” vest. In contrast, the tabard saying “polite” saw the nearest
average overtaking distance and almost twice as many potentially
dangerous passes as “police”.
The lessons seem clear and worrying. For one thing, no matter which
outfit was worn, a small percentage of drivers still overtook
dangerously near, at a distance of 50cm or less. More than this, it
seemed drivers were perfectly able to distinguish between different
types of rider, and to read and absorb any message displayed. But rather
than adjusting their driving to the perceived experience of the cyclist,
it was only when faced with a threat to their own welfare – a police
rider filming their actions – that many allowed a cyclist more space on
the road. Most alarming still, some seemed to treat the mild attempt at
deception of “polite” as a reason to almost punish the cyclist."
I don't recall hearing of this study.
Warning: The article linked above, from which this quote is taken, will
be offensive to some.
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- Frank Krygowski