|Characteristic||Estimates (percent)||Standard Error (percent)||Sample Size|
|Less than 4-year degree||95.4||1.9||132|
|4-year degree or higher||93.0||2.4||143|
|Household income less than $75K||95.3||2.2||137|
|Household income $75K or more||95.0||2.2||92|
|18 to 54 years old||93.1||2.1||170|
|55 or older||96.9||1.5||107|
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.