You'd be safer on a motorcycle.
I follow motorcycle grand prix (MotoGP) racing, and you'd be surprised the "offs" they regularly survive. There are regular injuries, to be sure, such as broken bones, etc. And there seems to be a death every few years. But generally, provided there isn't a barrier to stop a motorcyclist who has been dismounted, they will survive wrecks in excess of 150 mph.
The key is in how quickly (or rather, slowly) you are decelerated.
