It's about 40 pages long and was done for the Department of Transportation in London. Long winded, of course, but very interesting in parts. It talks about psychological and visual tests done on car drivers to determine why they don't see motorcyclists, and what motorcyclists can do about it.
Partly, it stated that high visibility colors do less than we'd expect, daytime running lights are good, and it recommends "lateral weaving" as one of the best ways to attract a driver's attention. Apparently, people see lateral motion very well, so if you're coming towards a left turner, you might want to weave a bit so they'll see you.
Best, of course, is to also expect them not to see you, and prepare to stop.
Here's the link. Maybe since it's winter, we'll all have time to wade through this: "Car Drivers’ Skills and Attitudes to Motorcycle Safety: A Review"
http://webarchive.nationalarchives.g...me2/rsrr85.pdf