1957-01-01

Motion Sensitivity as a Guide to Road Design 570041

HUMAN perception thresholds to motions and the various characteristics of motions in six degrees of freedom are presented.
Experiments made to establish these thresholds for disturbances of the duration or frequency that might arise from highway geometry—durations in the range of from one second to several hundred seconds—are described.
Applications of motion sensitivity criteria in the design of vertical and horizontal highway curves and transitions are developed, with examples from company proving grounds in Arizona and Michigan. The resulting geometric features of the high-speed road systems differ in several important respects from conventional highway practice and previous automotive test-track designs.

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