"Nearly 30% of all fatal accidents involving large trucks in the US happen during the hours of darkness" Correct me if I'm wrong, but don't we spend less than

"Nearly 30% of all fatal accidents involving large trucks in the US happen during the hours of darkness" Correct me if I'm wrong, but don't we spend less than 30% of the day in darkness? (Yes, I know that the time spent on the road trucking is probably less than 30% in darkness. This just felt like a sampling bias. Like: http://www.insurance.com/quotes/article.aspx/Car_Accidents_Happen_Closer_To_Home_Than_You_May_Think/artid/104 http://www.insurance.com/quotes/article.aspx/Car_Accidents_H...)