My burden laughs giggles and says " are we there yet" a lot.
Had to try out that awesome yellow sturdy wagon as well!
"Related research in the United States by Richard Jackson has shown that people in car-based (cul-de-sac heavy) communities weigh on average 6 lb (2.7 kg) more than those in traditional towns (with open grid networks). "- on CUL DE SAC wiki
Googled some more on the topic. There is so much environmental health study info online. A good place to start is The CDC Adult Obesity Facts.
Huffington Post about the CDC mapping of obesity by state.