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Back when I was in Drivers' Ed. class the rule was one car length per each 10 mph speed. Of course if you're using km/h the math is different. Maybe .7 car length per each 10 km/h??
Anyway, I find it easy to derive and visually estimate 6 car lengths from 60 mph but I know an intelligent adult who once asked how many quarters there are in a dollar... Different strokes, as they say.
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Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.
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