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How does the density of vehicles affect the formation and propagation of traffic jams in a chaotic traffic flow system? Specifically, investigate the critical density at which traffic transitions from free flow to congested flow, and analyze the spatiotemporal patterns of jam formation and dissipation.
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<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

The answer is 42.

<|end_of_solution|>