There is a cultural barrier in the CPS that seems to stop a driver being charged with manslaughter as the result of a collision. Instead they always want to charge with death by dangerous driving, which means thet they have to prove the standard of driving (as mentioned above). Whereas with manslaughter you just have to prove it was down to someones actions, allbeit unintentional
In such circumstances it would probably be negligent act manslaughter, and the standard of a reasonably competent and careful driver would still need to be considered. 'Normal' manslaughter is where you can prove a deliberate act, the unintended consequence of which is death. And there, you'd run into evidential issues. Even where something IS deliberate, it might be that it doesn't look like that to any witnesses. If there are any. Which usually, there aren't.
In such circumstances it would probably be negligent act manslaughter, and the standard of a reasonably competent and careful driver would still need to be considered. 'Normal' manslaughter is where you can prove a deliberate act, the unintended consequence of which is death. And there, you'd run into evidential issues. Even where something IS deliberate, it might be that it doesn't look like that to any witnesses. If there are any. Which usually, there aren't.