A new study shows that teen driving gets riskier the more teens are in the car — data unfortunately reflected in recent car accidents in the Washington area, according to AAA Mid-Atlantic.

The new study by the AAA Foundation for Traffic Safety — released in time for Teen Driver Safety week, which takes place this week — shows that 9,578 16- and 17-year old drivers were involved in fatal crashes between 2005 to 2010, and nearly 4,000 of those had at least one teen passenger.