|Characteristic||Estimates (percent)||Standard Error (percent)||Sample Size|
|Less than 4-year degree||91.9||3.3||130|
|4-year degree or higher||88.6||3.0||138|
|Household income less than $75K||91.3||2.9||134|
|Household income $75K or more||88.8||4.3||88|
|18 to 54 years old||87.4||3.0||162|
|55 or older||97.2||1.5||108|
NOTE: All estimates are weighted to represent U.S. noninstitutionalized adult population (18 and older).
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, Omnibus Household Survey, December 2004.