The NPS tracks Lassen visitors by counting vehicles entering the park ... - dofaq.co
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The NPS tracks Lassen visitors by counting vehicles entering the park ...

wikipedia - 22 May 2022
The NPS tracks Lassen visitors by counting vehicles entering the park via in-road inductive loops at all vehicle entrances. Buses and other non-reportable vehicles are subtracted from the vehicle count, which is then multiplied by three, an estimate of the number of visitors per vehicle.[14]

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