[Margh]

FWIW The Hurt Report[1] didn't find any link between motorcycle colours and crash numbers. I'd say that doubly applies to bicycles when you consider that even a small motorbike still has a fairly significant showing of coloured fairings. Reflective jackets on the other hand...

https://commons.wikimedia.org/wiki/File:MOTORCYCLE_ACCIDENT_...

[mschuster91]

A motorbike is mandated to have lights and cops enforce this, in contrast to bikes where most cops tend to let Darwinian evolution happen.