You maybe able to prove to "your" insurance company the the other guy / gal was a pillock,
if the accident was a little ambiguous as to blame / fault without the camera's evidence,
being curious here, are they actually legal?
That is, would the "evidence" stand up in court?
Or indeed is it admissible?
So an accident occurs, you prove you weren't at fault,
The other side denies it, (we all know insurance companies are as wiggly as a worm on speed)
If the evidence is inadmissible, for a legal battle,
that's back to a 50/50 claim.
On a slightly different note,
I can also see that eventually they will be fitted as standard,
we have camera's watching our every move now, they may as well watch us in / and inside our cars too.
That way they can remove all the speed camera's saving the country a fortune on maintenance,
and just down load "our own evidence"
"I was only stopped on the double yellows for a minute"

"I didn't mean to stop on the cross hatch,
"I didn't mean to straddle a pedestrian crossing
the guy in front stopped suddenly.
Too late sunshine, your nicked
(Before anyone says don't break the limit / law and you have nothing to worry about,
think about other things you may use your car for, clandestine meetings with someone else's wife / husband,
Buggering off early from work etc. That'll do for a start, but the list goes on
So where is the best place to buy tin foil hats again?

)