Traffic jam can be explained by mathematical equations
One idiot who pressed the brake too hard will cause ripple effect and slow down the rest of the traffic
From Physorg.com...
Dr Orosz continued: “When you tap your brake, the traffic may come to a full stand-still several miles behind you. It really matters how hard you brake - a slight braking from a driver who has identified a problem early will allow the traffic flow to remain smooth. Heavier braking, usually caused by a driver reacting late to a problem, can affect traffic flow for many miles.”
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