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This paper investigates the ride comfort provided by cars equipped with passive and semi-active suspension systems. This investigation is part of a feasibility study for a high speed freeway system for the State of Texas that is proposed for the year 2020. The investigation described in this paper tested two automobiles, one with a passive suspension and one with a semi-active suspension at speeds from 30 mph to 80 mph. The two cars were identical in all other operational aspects except their suspensions. The tests determined the magnitudes of the linear accelerations of the automobiles' front passenger seat for the various testing speeds. These accelerations were converted into a form which could be compared to the International Organization for Standardization (ISO) standards pertaining to the relationship between these accelerations and rider comfort. The ride comfort at 150 mph was predicted from extrapolation of the test data.