not such a good thing. black boxes only contain a few seconds of data. Not enough info to get a complete before/during/after picture.
not all cars have them, which makes it's legal use seem discriminatory.
My reading indicated 5 seconds of data is retained (at least in early GM EDR designs). That doesn't seem like a long time. A lot can happen in 5 seconds before an accident. It would be nice to see that extended.
"black boxes only contain a few seconds of data"
lets see. car, skidding, on an icy road, couple seconds of data...
if you go into a skid on an icy road and your foot is on the gas, engine will very quickly rev up and altho you may actually be in motion at 5mph your speedometer can easily register at 58mph.
bad defense lawyer.
The highway patrol cop can not see every illegal driving act. Does this make the use of cops on patrol seem discriminatory.