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this post was submitted on 29 Aug 2023
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For car distance I've seen 2-3 seconds start to be recommended, since people are not good at judging distance. So counting how long it takes to reach the same fixed point as the car ahead.
Car length per 10mph is much easier in my opinion. 2-3 seconds isn't based on any speed so by itself is quite useless. Your car's stopping distance changes with speed. It won't always be 2-3 seconds. Let alone counting reaction time at higher speeds.
Seconds is based on speed though. It's literally how speed is defined. Distance over time. At 60mph you travel 88 feet per second. So if you count out the seconds between when the car ahead passes say a road sign and you pass the same road sign and it's two seconds, there's roughly 176ft between your two vehicles. If you're going 25 mph, then two seconds equates to 73ft of space.
Which really gives you more space than car lengths per 10mph, so it's safer. 10mph=~14fps. The average length of a car is 14ft. So you end up giving double the space if you count out 2 seconds.
I cannot not think 14 frames per second when I see that.
The driver can only perceive 14fps