Teen fatalities from car accidents tend to rise in the summer.

Teens have more time for adventures when high school is out for the summer, but these escapades can often turn deadly when they’re driving.

Ohio dad Brock Dietrich knows this all too well. His 17-year-old daughter, Sydnee Williams, died in a 2013 car crash after using her phone behind the wheel.

“She was not wearing her seat belt either, and so as a result, she was thrown from the vehicle and suffered fatal head trauma,” says Dietrich. He now works with the nonprofit organization Impact Teen Drivers to educate teens and parents on the dangers of driving while distracted and safe driving practices.

Parents should keep the following facts in mind when talking to their teen about safe driving.

1. Car accidents are the leading cause of death for teens. Plus, the number of teen crash fatalities tends to rise during the summer months, according to a AAA analysis.

These accidents are often preventable. Parents can help by modeling appropriate behavior, such as by turning off or silencing cellphones prior to driving, and by discussing what safe driving looks like, says Dietrich. These actions should begin at an early age and continue once a teen is licensed.

“I have the regret of, I didn’t do a good enough job of modeling that normal, good driving behavior for Sydnee,” says Dietrich. “I live with the guilt that she learned some of the behaviors from watching me.”

The National Safety Council and National Highway Traffic Safety Administration offer online resources for parents of teen drivers.

2. Often people other than the teen driver get injured or killed. And all states have graduated driver licensing laws, which can include restrictions on passengers for teen drivers. Dietrich had rules for his daughter that were stricter than laws in his state, he says. The night of the crash, she was only allowed to have one passenger in the car, but actually had two.

“There’s lots of rules thrown at teenagers,” he says. Teens need an explanation as to why those rules are important – something he says he didn’t provide to his daughter – or else they will rebel, he says.

3. About half of teens who died in car accidents weren’t wearing a seat belt. Teens have the lowest rate of seat belt use, despite the fact they cut crash-related injuries and deaths by about half, according to the Centers for Disease Control and Prevention.

One passenger in Sydnee’s car was wearing a seat belt appropriately and walked away from the crash physically uninjured, Dietrich says. The other passenger was wearing a seat belt too, but she placed the shoulder harness behind her back and suffered serious injuries.

Dietrich says the passengers told him that on the night of the crash, Sydnee – who typically wore her seat belt – was wearing it early in the evening, but forgot to put it on the last time she got in the car.

“They let what’s going on at the time when they get in the car distract them from what they really need to do,” he says. Teens need to make a habit of making sure everyone is wearing a seat belt each time they hit the road.

Distractions are often a factor in teen crashes.

“It’s not that the teens are intentionally going out there attempting to be reckless,” Dietrich says.

He believes that cellphones, for example, have become so ingrained in our culture that when a phone rings, people don’t even think before they respond. When someone gets in a car, it’s just their natural reaction to look at their phones when they get an alert. Teens may see adults displaying this behavior and think it’s OK.

“It comes down to not lecturing to them, but providing the teens with the information to encourage them to make the right decisions when they are in the car,” he says.

Original story by Alexandra Pannoni for USNews.