TABLE 2 Variable List

TABLE 2 Variable List

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Variable Description
Tract or zip U.S. census tracts and five digit zip code tabulation areas (an aggregation of census blocks) were used to define the boundaries for local land-use characteristics
Driver status Driver status of respondent: licensed, not licensed, or not appropriate
Worker status Worker status of respondent: working, nonworking, or not appropriate
Age Age of respondent: 0-5 years, 6-16 years, 17-65 years, 66 years and more
Vehicle count Number of vehicles in household: 1-9 or more
Household size Household size: 1-9 or more
Race Race of the head of household: White, African American, Hispanic, other (including Asian)
Driver count Number of drivers in household: 1-6 or more
Personal income Household income divided by number of persons in household; 11 classes from $0-$100,000 or more
Transportation mode choice Transportation mode choice among motorized options, walking and biking, or transit (including buses, metro, and rail)
% low residential Low-density residential: detached single-family/duplex dwelling units, yards, and associated areas; areas of more than 90% single-family/duplex dwelling units, with lot sizes of less than 5 acres but at least half an acre (0.2 dwelling units/acre to 2 dwelling units/acre)
% medium residential Medium-density residential: detached single-family/duplex, attached single-unit row housing, yards, and associated areas; areas of more than 90% single-family/duplex units and attached single-unit row housing, with lot sizes of less than half an acre but at least one-eighth acre (2 dwelling units/acre to 8 dwelling units/acre)
% high residential High-density residential: attached single-unit row housing, garden apartments, high-rise apartments/condominiums, mobile homes, and trailer parks; areas of more than 90% high-density residential units, with more than 8 dwelling units per acre
% commercial Commercial, retail, and wholesale services; areas used primarily for the sale of products and services, including associated yards and parking areas
% industrial Manufacturing and industrial parks, including associated warehouses, storage yards, research laboratories, and parking areas
% vacant Vacant land, such as bodies of water
% other Other land uses
Road density index Liner road length over square areas, 10 classes, with a lower value indicating denser road networks