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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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This is for strictly mildly interesting material. If it's too interesting, it doesn't belong. If it's not interesting, it doesn't belong.
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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?