The contact was driving a 2024 Ford Edge rental vehicle. The contact stated that while traveling in stop-and-go traffic the rental vehicle was involved in a multi-vehicle crash. The rental vehicle was crashed into from the rear and pushed into a second vehicle. A third vehicle was then pushed into the rental vehicle causing the rental vehicle to be pushed into a guard rail and roll down a hill. During the crash, the front driver's side air bag did not deploy. The contact sustained left leg, lumbar, neck, and abdomen injuries that later required medical treatment. One additional injury was reported from a second vehicle included in the crash. No further information was available. A police report was taken at the scene and the vehicle was towed to the local towing yard. The cause of the failure was not yet determined. The manufacturer was notified of the failure but no assistance was offered. The local dealer was not contacted. The failure mileage was 3,000.