Your black box measures bits of your driving that we know are dangerous. This includes how fast you drive compared to the speed limit, how sharply you brake, accelerate and corner, and when you drive (the time of day, how often in 24 hours, and the length of your journeys). We look at how often, or not, these things happen and caluclate your feedback based on that. This means your feedback shows how you drive most of the time, but occasional mishaps don;t hurt too much.
Find out everything you need to know about how your driving style is measured.