In message , Mary Fisher
writes
[snip]

Incidentally, their was a study some time ago (no reference sorry) which
suggested that the most invisible setup was a big white bike with the
rider in flourescent clothing (ie local plod). Don't know what came of it
though so I could just (once again) be talking shee-ite.

I think you are. Or the 'study' was flawed.

It is related to contrast - we recognise contrasting objects quicker
than any specific colour of object. The problem with big white bike and
bright yellow jacket is the lack of contrast. A contrasting colour
scheme (including the high vis yellow) is far more likely to be noticed
(or noticed quicker).

It was a Rospa intructor who first shocked me with that tidbit many
years ago.
Someone