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The majority of drivers don't even know they follow too close!! I catch myself breaking the minimum two second rule but many drivers don't even allow themselves one second of distance!!
I would bet you're numbers are badly skewed since your reporing is from drivers themselves, many of which have poor judgement and knowledge of safe following distance.
I would confidently suggest a realistic figure be that about 85% of drivers regularly tailgate, 40% at less than one second distance, and 20% dangerously close.