Why do we get car sick but not when driving?

Motion sickness happens when the brain receives conflicting signals: the inner ear senses movement while the eyes, often focused on a phone or book, see something stationary. Drivers rarely get sick because their brains anticipate every turn and bump through the steering wheel and pedals, keeping vision and balance in sync. Passengers staring at a screen get the worst mismatch. Looking at the road ahead, opening a window for fresh air and sitting in the front seat all help. Some researchers think motion sickness is an evolutionary defence against perceived poisoning, since many toxins cause dizziness.