Anyone who's ever had motion sickness can tell you it's not very pleasant. In mild cases it gives you a dicky tummy in the worst cases it'll make you physically sick.
Here's recipe to help curb or even prevent altogether the onset of travel sickness.
2 drps peppermint pure essential oil
2 drps of ginger pure essential oil
10 ml carrier oil (grapeseed is the most popular)
Massage the chest and stomach in a clockwise direction about an hour before travelling.
Finally take a tissue and add 2 drops of peppermint and 2 drops and ginger essential oil to it and tuck it down the side of your seat. Alternatively you could add the drops to some kind of cloth or preferably a hand sized wheat bag and place over the heater which will blow the scent around your vehicle.