The fare supplement without a tariff

A fictional Chinese cruising-taxi training case begins with a passenger asking for a journey to a rail station. The driver proposes an extra payment because the destination is busy and says that a platform application sometimes charges more at peak periods. The exercise does not supply a local tariff authorizing this supplement, an agreed lawful service outside the ordinary metered arrangement, or a verified toll. A road closure later makes a detour necessary, and the passenger asks what has changed. The task distinguishes an unsupported charge from a real route disruption that should be explained. No city-specific amount, taximeter starting fee or universal refund rule is supplied. The learner must identify the missing evidence and a professional way to document the journey without inventing a legal entitlement.