Speed in itself is not dangerous and to satisfy the CPS charging standard he must fulfill two criteria:

(i) the way he was driving falls FAR BELOW what which would be expected of a competent and careful driver AND:
(ii) it would be obvious to a competent and careful driver that driving in that way would be dangerous.

I think it is fair to state that a high powered car with good brakes and an experienced driver could be safe driving at well over a ton in the right conditions. I'm not endorsing speeding but always believed that speed is only appropriate in some circumstances. After all the police drive at up to 150 mph on Advanced driving courses and that isn't considered dangerous.