Came across this report about motorcycle crash causation and the role of conspicuity... from circa 1978. It's based on 1974 VicPol data! 1974! And it references other studies that go back into the 60's. So roadsafety has been talking about this topic for almost 50 years. http://www.svmc.se/upload/Se Oss/australien_1979.pdf Some take home messages for me, particulary in the context of the Victorian TAC funded focus and attack on rider casualty rates, is that in 1974 there were some 1500 casualty crashes resulting in almost 80 deaths. Back in in 1974 there must have been about a quarter of the number of motorbikes on the roads! In comparison to today, Victoria has a five year average of about 44MC deaths and 900andsomething serious injuries a year. Almost 80% of casualty crashes involved another vehicle, half were the fault of the other vehicle. NOT A WHOLE LOT HAS CHANGED!! The key table is this one: Of the two vehicle crashes, 17% of crashes were the result of the driver's own vehicle obscuring the bike! With today's massive A and B pillars, that would have to be higher. A surprising 11% was the motorcycle hitting a stationary car (parked car?). 21%, drivers simply didn't see the motorcycle for "no apparent reason". The report does not make any recommendations about how to improve conspicuity.