carsick

from WordNet (r) 3.0 (2006)

carsick
    adj 1: experiencing motion sickness [syn: {airsick}, {air sick},
           {carsick}, {seasick}]

from The Collaborative International Dictionary of English v.0.48

carsick \car"sick`\ (k[aum]r"s[i^]k`), adj.
   feeling nauseous due to the movement of a car or other land
   vehicle; -- similar to {airsick} and {seasick}.
   [WordNet 1.5]