Kimberley Firestone, the 16-year-old great-granddaughter of the founder of the Firestones Tire and Rubber Co., was killed Thursday when her car and a truck collided on River Road as she drove to work. Montgomery County police reported.

Police said Miss Firestone's automobile drifted across the center lane and struck the flatbed truck head-on. They said she may have been distracted from the road because money was found in her hand and an open orange purse on her lap. She was pronounced dead on the scene.

The driver of the truck, Walter Moore of 119 Thomas St. NW, an employee of United Materials and Services in Alexandria, suffered no injuries, police said.

The oldest of five children, Miss Firestone was about to enter her senior year at the Foxcroft School in Middleberg. Va., where she had been elected senior class president. She was also active in drama productions there and in the school newspaper and literary magazine, according to her father Kimbal Firestone, a member of the tire company's board of directors.

During the summer, Miss Firestone had been working as an intern in the Capitol Hill office of Rep. J. William Stanton (R-Ohio). Today was to have been her last day at work before leaving for a vacation.

In addition to her parents, Miss Firestone's survivors include a sister Cary, and three brothers, Leonard, Christopher and Curtis, all of the home in Potomac.