A driver was critically injured early Saturday when a tractor-trailer struck a stopped car on westbound Interstate 270 in Hamilton Township near Obetz, according to the Franklin County Sheriff’s Office. The crash happened shortly before 3:45 a.m. west of Lockbourne Road. A 2002 Volvo VNM tractor-trailer was traveling in the right lane when it hit a 2016 Kia Optima stopped in the lane, authorities said. The Kia driver, its only occupant, was taken to Grant Medical Center in critical condition. The truck driver was alone and was evaluated by medics at the scene. The sheriff’s office is investigating. Anyone with information can contact its Crash Investigation Unit at 614-525-6113.