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You are suggesting that people distract themselves even more than they are already. The 3-second rule requires looking off to the side of the road and having a grasp on what three seconds duration is. One can count 1-one thousand, 2-one thousand, 3-one thousand in 1 second or 10 seconds. This is a country where most people cannot multiply 12 x 11 without a calculator and you are asking them to do this? What was wrong with one car-length for every 10 miles per hour? Seems much simpler to me.