Abstract
The day-to-day variations in the numbers of accidents on the State Highways of California in 1970 have been studied with reference to the time of year and the weather type. The weather was found to be a major factor affecting accident numbers. The mean number per day was 353 and the overall variance 11158. The variance was reduced by over 70% when 23 wet days, Christmas Eve and Christmas Day were excluded. On very wet days the number of accidents was often double that of corresponding dry days. Single-vehicle accidents were affected more by wet weather than were most other types of accident studied.
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