The contact owns a 2022 Kia K5. The contact stated that while driving at 70 MPH with the driver-assist feature, activated, there was another vehicle driving slower at approximately 50 MPH was in front however the vehicle's feature did not automatically decrease in speed causing the contact to rear the vehicle. The air bags did not deploy. The contact had his daughter and her husband at the time of the incident where both sustained a concussion, fractured nose, and arm injuries. Both passengers were taken to the hospital. A police report was filed. The contact was unaware of the passengers in the other vehicle sustained any injuries. The vehicle was towed to an impound lot due to it not being drivable. The dealer and the manufacturer were not notified of the failure. The failure mileage was 5,000.