Full article here and is very interesting;

http://www.ulyssesfremantle.iinet.net.au/wheezy/may08.pdf

The secretary general of the International Motorcycle
Manufacturers’ Association, Dr Nick Rogers, says that
on its own, speeding is not a major contributor to the
road toll. “Research in Europe shows that the vast majority
of accidents occur below 50 km/h, so speed is
not the issue; it is an aggravating factor when something
else goes wrong. “It is not true to say that because
people are going fast, that is why they have an
accident. Speed is just a distraction from other issues
such as perception failures by riders and other motorists,”
he says.
Dr Rogers is in Australia to address the inaugural Australian
Motorcycle and Scooter Safety Summit, held in
Canberra on April 10 and 11, 2008.

Also

Lennard agrees. “Very few crashes are caused by a loss of
rear wheel traction under acceleration,” he says. Last year,
15 per cent of all road fatalities in Australia involved motorcyclists.
Lennard claims 40 per cent of those involved single
vehicles, 20 per cent involved two vehicles with the cyclist
at fault and 40 per cent involved two vehicles, with the
driver at fault.