If the motorbike had been going at the speed limit, he would be alive today
That is not true, it's possible, but do you really think that motorcyclists only die in RTAs because they were speeding?
Boney TipTop gave you the name of the study, if you google clarke et al 2004 motorcycles, you should find something you can look at.
www.bikelawyer.co.uk/bike-accident-statistics
Right of way violations
Of the total cases, 681 (38%) involve ROWVs. However, less than 20% of these involve a motorcyclist who rated as either fully or partly to blame for the accident
The majority of motorcycle ROWV accidents have been found to be primarily the fault of other motorists
Just one thing from the report below.
speedcamerareport.co.uk/dft_motorcycle_accidents.pdf
Im going to try to link to page 40 of that PDF, if it doesnt work, skip to page 40!
It covers blame in RTAs involving motorcycles, be sure to read summary of both table 6 and 7.