1634
I can't disagree.
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What if they slam into a truck at highway speeds? Instantly they've gone ftom 100km/h to 0, and you have to stop your car before you slam into them. How much space do you need between you in this scenario?
With 2 seconds worth of space, you have about 55 meters between you, and a normal reaction time would be about 250ms, which leaves you 1.75 seconds and 48 meters to come to a complete stop. And hopefully the person behind you reacts accordingly and doesn't slam into you as well.
This is the answer, and is exactly what happens when you see those accidents involving like 6 Plus cars. Too many people riding way too close together at high speeds and none of them were able to stop in time when the first car suddenly stopped