Metrication of road signs and driver behavior

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On the day following metrication in Canada there was a decrease in mean speed of all vehicles (N = 2,424) of about 1.9 km/hr and an increase in speed variability by an average of 28% compared with premetrication norms (N = 9,413). Follow-up surveys indicate that within 2 wks following metrication, drivers had returned to premetrication velocities for all sites surveyed. (1 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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