Widening a road may shorten car trips at first. But if some bus passengers respond by driving, bus ridership falls. A transit agency trying to balance its budget may then run fewer buses, making transit less attractive and sending still more travelers to cars.
Road capacity first increases, and a visible group switches modes. The resulting loss of bus riders prompts a highlighted reduction in service frequency, followed by another round of switching. Rather than animate every small adjustment, the film moves to the new equilibrium and compares it with the original one. The paradox is that a road improvement can produce a worse combined road-and-transit outcome once the service response is included. Its lesson is about an interconnected transport market: evaluating a highway project from its immediate car-time saving alone can miss the effects it creates through transit frequency and mode choice.
Bus bunching can begin with a very small delay. A bus that reaches a stop late finds more passengers waiting, spends longer boarding them, and falls farther behind. The following bus encounters fewer waiting passengers and catches up. The original even spacing can collapse into a pair of buses followed by a long gap.
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A longer urban train could carry more passengers, but extending every platform is costly. The front-and-rear operating idea uses a train longer than its platforms while controlling where it stops and which doors open, so travelers can still reach the correct station safely.
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A trunk bus line can move people efficiently along a corridor, yet passengers living far from its stops may face a long walk at both ends of the trip. That access burden can make an otherwise fast line unattractive.
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