Motorcyclists refer to these kinds of accidents as SMIDSYs -- "Sorry man/mate, I didn't see you". This article recommends disrupting the "motion camouflage" effect by weaving from side to side in your lane.

http://www.motorcycleinfo.co.uk/index.cfm?fa=contentGeneric....

I'm sure it would work for bicycles as well if you have a headlight installed.