The so-called 100 days of summer fall between Memorial Day and Labor Day, when school is out. In a study published by the American Automobile Association, researchers found the average number of deadly teen driver crashes climbs 15 percent during this time period compared to the rest of the year. Teens are also three times as likely as adults to be involved in a deadly crash during these 100 days. AAA found that top factors in deadly teen crashes are: distracted driving, not buckling up and speeding.