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The Subjects Furnished for This Document by Hsri Are: Passenger Cars, Passenger Motor Vehicles, Vehicle: Density, Traffic Units, Traffic: Exhaust System, Power Plant, Vehicle Parts, Vehicle: Pollution, Regional Planning, Socioeconomic Aspect: Sampling, Statistical/Probability, Mathematical, Methods: Field Experiment, Nature of Study, Study-Report Type: Tables/Graphs, Contents.
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Conlee et al. (1967) studied this question.
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