The ConsumerStyles and recontact surveys are conducted annually by a market-research firm with technical assistance from CDC. For the ConsumerStyles survey, stratified random sampling (by region, household income, population density, age, and household size) was used to identify 10,000 potential respondents from a larger consumer-mail panel of approximately 600,000 adults aged ≥18 years. A low income/minority supplement and a households-with-children supplement were used to ensure adequate numbers of respondents from those groups. Of the 10,000 identified, 6,207 responded to the initial survey (62% response rate). The recontact survey was mailed to all respondents within 4-6 months of the initial survey and had a 68% response rate (N = 4,213). For that survey, parents of children aged 5-18 years were asked how many times their youngest child walks to or from school during a usual week and whether one or more of six barriers (too dangerous because of traffic, too dangerous because of crime, live too far away, no protection from the weather, the school does not allow it, and other reasons) prevents that child from walking to school. Results were weighted to reflect the age, race/ethnicity, sex, income, and household size of the U.S. adult population, as determined by the 2000 U.S. Census.