^Trivia: Congested traffic, traffic jams, etc^

^Trivia: Congested traffic, traffic jams, etc ALWAYS occurs when the density of cars reaches 40 vehicles per mile. Why?

No matter how smoothly traffic is flowing, once it reaches 40 cars per mile and beyond, the little speed up/slow down that everybody does when driving quickly add up at the front of the line, causing a temporary mini jam. That leads to a minijam behind it as the 1st bunching of cars clears up, and so on like a catepiller moving down the line.^

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