They are complicated so I might make a thread in the general section of the forum.
Long story short 95% of new cars sold in Australia record data about the vehicle if a collision occurred. This can be downloaded for use in collision reconstruction, but you must be trained and certified to do so.
I'll post something up about this today.
Sounds interesting mate. I would be interested in doing something like this. I'm sure everyone has their days at work, but I'm sure the work is interesting everyday