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This paper summarizes a comprehensive research program of the ride qualities of long-haul trucks. Factors are identified which contribute significantly to differences in ride quality between various truck models and configurations over a range of actual operating conditions. Detailed measurements of six floor and seat accelerations and driver and passenger ride ratings were made on ten in-service trucks over five segments, ranging from “smooth” to “rough,” of a typical California freeway. The experimental methodology is reviewed and validated, and example data and preliminary comparisons between the objective and subjective measures are presented.

Rider control techniques and the handling qualities of all terrain vehicles (ATVs) are discussed. A manual control view is taken of the rider/vehicle/terrain system, including control inputs to the ATV and perceptual feedbacks to the rider. Steering control, overturning stability, and acceleration limits are considered. The important role of rider body movement is discussed. Comparisons are drawn with motorcycles and off road buggies. Vehicle system requirements that can be important from a design standpoint are reviewed.