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Green et al. residential traffic and children’s respiratory health (Kim et al. 2008), two traffic metrics, traffic density and maximum AADT within 150 m, were similarly associated with current asthma and with bronchitis. Strengths. In this prospective cohort study we collected detailed interview informa- tion directly from the study participants and included information about demographics, lifestyle factors, work exposures, and residen- tial history. We were able to directly control for SES, which was related to traffic exposure. Also, we had individual-level information about air conditioning use, commute times, and mode of transportation, which allowed us to evaluate these factors as potential con- founders and effect modifiers. We had a complete residential history for each woman; therefore we were able to select the residence at the time of the LMP if it dif- fered from residence at the time of interview. 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