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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.
This is obviously an objective criteria, so the mods are always right. Or maybe mildly right? Ahh.. what do we know?
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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