of the male car drivers killed or injured between 10 pm and 4 am,when it is nearly always dark,about one-half are under 25 years of age.between 10 am and 4 pm,when it is almost always light,the proportion is about one-quarter,while during the rest of the day nearly 30 per cent of the casualties are under 25.these differences probably arise from corresponding differences in the amounts of travel, and,because the dark hours are more dangerous they contribute to the high accident rate of young drivers.this report estimates this contribution.it was assumed that during the above dark hours the casualty rate for drivers of any one age group is double that during the day hours, and during the mixed hours (4 am to 10 am and 4 pm to 10 pm ) is 25 per cent above it.it was then found that if the distances driven by young (under 25 years of age) car drivers were distributed over the day in the same way as for older drivers,their casualty rate would be about 9 per cent lower than it is at present.it would,however, still be more than two and a half times the rate of older drivers (a).

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