Scientists at Johns Hopkins University have found that assessing a community's cancer risk could be as simple as
counting the number of trucks and cars that pass through the neighborhood.
Another reason to encourage the development of public transport.
Not that anybody's listening here, with the government falling over itself to spend billions of dollars on new freeways and spending only the most grudging pittance on public transport (which is next to useless outside of the inner city).
(thanks, Toby)