Raise the Hammer is a Hamilton, Ontario based website with a great deal of bike related info. Warning: it skews left (for those who care). Some of it's post include this one about the relationship between speed in an accident and how fatal it is and this one on Can Bicycles Save Civilization. For the speed thing, it's just as you'd expect.
The British Department of Transport issued a shocking report in 1997 titled Killing Speed and Saving Lives.
It found that the rate of pedestrian fatality on being hit by a vehicle rises from five percent at 32 km/h to 45 percent at 48 km/h to a devastating 85 percent at 64 km/h (the fast edge of the so-called "green wave" of timed lights).
So while it's possible to be hit and killed by a cyclists (as we saw recently) it is significantly less likely. And this chart below doesn't even account for vehicle weight. Which is why when headlines read "Pedestrian hit by bicycle" it seems less accurate than "Pedestrian hit by car." Since the bicycle was probably lighter than the cyclist, they were really hit by a person on a bike.
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