Conclusions
Only a small fraction of respondents walk, but trips longer than 0.25 miles are common. There is substantial variability in the distance and duration of walking trips by purpose and population subgroups. These differences have implications for developing strategies to increase physical activity through walking.
istance decay functions have been used in geography to mathematically describe how a given phenomenon varies as a function of distance.27, 28 Specifically, the longer the distance to the destination, the less likely people are to travel to it by walking. Distance decay functions have been used to describe the distribution of walking as a function of distance for walking generally,29 for different walking purposes,20, 21 for transit walking,30, 31 and for multimodal trips.32