8/19/2023 0 Comments Rain in la![]() ![]() “That’s why you see more accidents in non-peak hours.” “People do not make those adjustments even on a wet surface,” said Mohammad Khan, a senior staff transportation engineer with Caltrans. The reason why might stem from how much more dangerous it is to drive at high speeds in the rain. Accidents generally peak in the middle of the day, when traffic is lighter. When it rains, the opposite pattern emerges. Conversely, dry weather with open roads allows drivers to cruise along with a lower risk of incident. driving: In clear conditions, accidents are clustered like a dumbbell, rising during the morning and evening rush hour, but falling during the middle of the day.ĭry weather with heavy traffic - when cars are bunched up together - tends to lead to more fender benders. Our data analysis illustrates an oddity of L.A. We compared the total number of accidents in each grid for each specific hour during wet weather against the number of accidents in each grid during dry weather.įor example, this approach allowed us to compare rainy conditions on a Monday between 2 p.m.We queried weather data for each hour in each grid for a period of almost three years.(We excluded some rural and mountain areas where there are no roads.) We split the county up into 236 separate grids of 16 square miles each.We looked at accident data from 2016–2018 compiled in a Southern California transportation data system called TransDec. ![]() In order to account for these differences, here’s how we parsed the data: It could be raining in the mountains and sunny at the beach, or drizzling in the morning but clear at night. When it rains really hard, though, people don’t seem to drive as much.”īecause Los Angeles County is so vast, spanning more than 4,750 square miles, weather conditions can vary from one part to the next. ![]() “When it drizzles and it hasn’t been raining recently, it’s a disaster,” she said. Rosalinda Tinajero of Urbano’s Auto Body and Paint in San Fernando says that the biggest crush comes right after the first rain, when grease leaking from cars has accumulated on the roadways and even a light mist can make the asphalt slick. Mid-Valley Auto Body in Tarzana estimates that its business this January was up 20% from this time last year because of the wet weather. That has meant more accidents, which, in turn, has meant more business for auto-body repair shops. It has been a particularly rainy winter, with Downtown Los Angeles recording more rain in the past four months than it gets in a typical year. and 8 a.m., there are almost three times as many accidents. and noon there are four times as many accidents reported than when the weather is clear.
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