Most vehicles have trouble reaching 1g braking decelerations. Collision decels can to to ~ 50 g’s
They’re not looking for the 50g’s, that’s an accident, they’re going to hear about that. They’re looking for the 1g’s, almost an accident, you don’t tell them about that, but the more often it happens the more likely the 50g’s. That’s why your rates go up when you get a ticket, it shows risky behavior. This is just pulling more consistent data, high speeds, jammed on brakes, late driving, lots of steering (generally means you’re drunk or tired), stuff that increases your chances of getting in an accident. The risk factors are well documented, the telltales are well known, that’s what they’re recording.