If you walk or bike to work besides for getting exercise and saving money on transportation cost, it is also safer. Auto collisions are the leading cause of injury-related deaths (Wikipedia). To insure your safety use reflective wear
and bicycle lights
especially when walking or biking early in the morning or in the evening when it is dark.
Those who walk or bike to work are definitely out numbered, although it is definitely a smarter way to travel.(If work is too far, you can also walk or bike part of the way to a bus or train stop).
Here are the new numbers for New Jersey on how they commute to work (according to the new US census - see: http://factfinder.census.gov/home/saff/main.html?_lang=en).
* 0.31% Biked (US 0.5%),
* 3.35% Walked (US 2.9%)
* 10.75% took transit (US 4.95%)