My son was driving on the highway with the adaptive cruise control on. The car in front of him stopped suddenly. The dashboard screen system flashed the word "brake" but not in enough time for him to react. He braked hard but he still rear-ended the car in front of him. The problem has not been reproduced or confirmed because the car is no longer drivable. It is sitting at my house waiting for repair of $7,700 damage. I thought the "Honda Sensing System," the combination of the adaptive cruise control and emergency braking, was supposed to bring the car to a halt. My son and his 3 friends were put at risk. I'm very disappointed in the car.