Using your MacBook while traveling may make you feel nauseous because your eyes are locked on a fixed screen, but your body senses the vehicle's movements. This disconnect between what you see and what you feel triggers motion sickness.
Try repositioning your laptop so your peripheral vision can catch some of the external movement, helping to balance the conflicting signals. Additionally, you could try Carsick.app, which adjusts your MacBook’s display to move in sync with the vehicle, helping reduce nausea and discomfort.