Motion sickness is a common problem affecting 1 in 20 people while travelling. Symptoms are nausea, vomiting and light-headedness.
To try and avoid motion sickness choose your seat to minimize motion. Try and stay still in a semi-reclined position, if possible. Avoid eating big meals, reading, alcohol and cigarette smoke while travelling. There are over the counter and prescription drugs available
It is best to sit in the following positions to minimize motion sickness:
CAR: drivers seat or second best in the front passenger seat
BUS: near the front by an open window
PLANE: cabin seat over the wings or wheels
BOAT: cabin close to the middle