CARHH (HV212) indicates whether any member of the household owns a car or truck (or other motor vehicle). The specific type of motor vehicle mentioned varies across samples. See Comparability.
The information in CARHH is taken from the household record and applies to regular household residents, not temporary visitors. Researchers may wish to exclude visitors using the RESIDENT variable when women, children, or births are the unit of analysis, and using the HHRESIDENT variable when household members are the unit of analysis.