I&#x27;ve just spent a week here in the UK driving with an insurance company&#x27;s app which tracks your driving. I got 9.3&#x2F;10 after the mandatory 200 miles of driving, and wild generally consider myself to be a safe driver on the road - I&#x27;ve done a fair amount of rally driving, and ridden motorbikes for nearly 30 years so I&#x27;m reasonably aware of the risks and what can go wrong, plus I drive a van as my daily driver.<p>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&#x27;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&#x27;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.<p>However, I&#x27;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.