Syag, are you asking for numbers to support the joke? sure, here they are,
0.79 fatalities for driving per 100 million traveled miles on urban roads
< 0.5 for flying commercial
but higher for using general aviation – 10
harder to find risk of walking – too many articles about benefits of walking a mile or two 🙂
one reference saying waking is 40 times more dangerous. Surely depends on where you are walking – downtown Chicago may be more dangerous than some other places.