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DiMarco, Richard J.
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A Downhill Grade Severity Rating System

Systems Technology, Inc. Hawthorne, CA-Walter A. Johnson, Thomas T. Myers, Richard J. DiMarco, R. Wade Allen
Published 1981-11-01 by SAE International in United States
A Grade Severity Rating System (GSRS) was developed as a means for reducing the incidence and severity of truck accidents on downgrades. The ultimate result is a roadside sign at the top of each hill. The sign is tailored to the individual hill and gives a recommended maximum speed (to be held constant for the entire grade descent) for each of several truck weight ranges. This concept represents a major step forward in terms of grade descent safety because it tells the driver what to do directly, rather than giving him information which still requires evaluation under different loading conditions.
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Correlation and Evaluation of Driver/Vehicle Directional Handling Data

Systems Technology, Inc. Hawthorne, CA-David H. Weir, Richard J. DiMarco
Published 1978-02-01 by SAE International in United States
Results of a study to analyze and correlate handling-related driver/vehicle system response and performance data are reported. Steering control tasks involving maneuvers and disturbance regulation are emphasized. Correlations between vehicle handling parameters, objective measures, and subjective rating data have been made. These have lead to the tentative definition of values of steering gain and effective yaw time constant which are preferred for satisfactory handling qualities and performance for passenger automobiles.
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