Motor-vehicle drivers were examined at interview and on visual tests. Each was classified as #x2018; accident-prone.#x2019;. or #x2018; safe #x2019; on the basis of his known- accident record -and the distance he said he had driven, those with a rate of 3 or more accidents per 100 000 miles being classified as #x2018; accident-prone #x2019;, those with a lower rate as #x2018; safe #x2019;. On this criterion there were 34 #x2018; accident-prone #x2019; drivers to be compared with 74 #x2018; safe #x2019;.
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