When I learned around 20 years ago I was taught to leave enough room to allow yourself space to move around the car in front in case it doesn't start moving again. It seemed like a reasonable amount of space and I generally still follow that.
That being said, I was part of a rear-end chain (I was the 3rd one rear-ended) where I sometimes wonder if more space in between cars would have prevented me from getting hit. Though I do have no idea how much distance was left between the cars behind me.
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