From Longman Dictionary of Contemporary Englishcarsickcar‧sick /ˈkɑːˌsɪk $ ˈkɑːr-/ adjective MIfeeling sick because you are travelling in a car —carsickness noun [uncountable]
Examples from the Corpus
carsick• Paul remembers that the awful thing is that each time he never even felt carsick until after Ed threw up. 