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The air movement produced by various types of road vehicles has been experimentally determined in order to evaluate the potential of this air flow to destabilize nearby pedestrians. Six vehicles are used, as small as an automobile and as large as a tractor-trailer combination, driven at speeds ranging from 20 to 50 mph (23 to 80 kph), at distances to sensors of two to six feet (0.6 to 1.8 m), in order to quantify some of the chaotic effects of the air motion generated by these vehicles, and specifically, what destabilizing effect it can have on nearby pedestrians. For each combination of testing variables, the peak air speed, relative temporal gust occurrence, and settling time to ambient conditions were measured. The results are analyzed, and a discussion is provided regarding the relation of factors, such as vehicle speed and the distance to the speed sensor, to the magnitude of the maximum air speed recorded.