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The phenomenon known as "phantom traffic jam" occurs when sudden braking by one driver causes a chain reaction, leading to traffic congestion without any visible obstacles. Researchers demonstrated this with an experiment involving 22 cars, showing how a single brake can create a traffic jam. Eliminating these jams can save time and reduce fuel consumption by up to 40%. This issue often arises on highways, and can be mitigated by maintaining safe distances, avoiding abrupt stops, and driving at a steady speed.