I've just spent a week here in the UK driving with an insurance company's app which tracks your driving. I got 9.3/10 after the mandatory 200 miles of driving,

I've just spent a week here in the UK driving with an insurance company's app which tracks your driving. I got 9.3/10 after the mandatory 200 miles of driving, and wild generally consider myself to be a safe driver on the road - I've done a fair amount of rally driving, and ridden motorbikes for nearly 30 years so I'm reasonably aware of the risks and what can go wrong, plus I drive a van as my daily driver. What I was aware of during the tracking process was how little the app was aware of - if was sensing acceleration and GPS position, but nothing else, and given there were plenty of times that it wasn't aware of the on road situation (such as someone pulling out in front of me, a road blockage, traffic, etc), I was thinking that it really can't tell everything it needs to - or indeed if I put my indicators on when I change lane, etc. Even if you had a system that connected to this CAN bus to sense such things, the picture would be incomplete. However, I'm sure that it will be useful to a degree, but there will be plenty of outliers in the data where there are safe drivers who are marked as unsafe and vice versa.