It's not quite so cut and dried, though. As safety measures are introduced, people tend to increase risky behavior which ends up mitigating the new safety measu

It's not quite so cut and dried, though. As safety measures are introduced, people tend to increase risky behavior which ends up mitigating the new safety measures. For example, since you bring up roads -- narrower lanes make safer drivers: http://www.planetizen.com/node/80229/another-study-shows-narrow-safer-wide-traffic-lanes http://www.planetizen.com/node/80229/another-study-shows-nar...