this post was submitted on 15 Oct 2024
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The recommendation changed from car lengths to seconds decades ago, but wasn't well communicated fwict. I learned car lengths from my dad and then seconds when I got my motorcycle endorsement.
If everyone were leaving 2 seconds of space, it also reduces stop and go traffic that is caused, or at least exacerbated, by the traffic wave phenomenon. But that's even less well socialized.