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Hard-braking events as indicators of road segment crash risk
(research.google)
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this post was submitted on 09 Feb 2026
27 points (96.6% liked)
Mildly Interesting
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I've driven with Progressive Snapshot for a year and a half, and it beeps when braking harder than 7 mph/s (which is nearly the same rate as the study's 3 m/s^2). In my experience, it's almost always possible to avoid HBEs by keeping an appropriate following distance and looking beyond the car in front of you. I'm down to one HBE every 4.3 weeks, while driving an average of 118 miles/week. Not to say that identifying locations where many people are ~~breaking~~ braking aggressively isn't worthwhile, but I largely think people follow too closely, and there's not really a good reason to do so.
Edit: spelling
I was taught in driver's Ed to maintain a 3 sec following distance on the highway. I have a car that monitors it for me and the display tops out at 2.5. I usually maintain 1.5-2s in city traffic. My car's display gets anxious with less than 0.8... and most of the drivers I see on the road are keeping even less than that. It's very evident how little most drivers care.
3s is a good rule of thumb for highway. Iirc the CDL manual for my state said 1 second for a 20ft vehicle below 45mph, then add a second if it's above 45mph. Also add a second for every 20ft of vehicle length above 20ft.
Also add 1-2 seconds if the vehicle on front is a motorcycle, since they can stop on a dime
That's an interesting feature that I haven't heard of. Mind sharing what car it is?