Interaction design that saves lives

Recently, Scientific American pointed out the power of interaction design to save lives, specifically, by increasing organ donations. (Boldface added.)

For example, rates of organ donation vary widely within Europe, from 100 percent in France and Poland to 17 percent in the U.K. and just 4 percent in Denmark. The difference cannot be ascribed to different cultural views about organ donation but rather whether the country in question has a policy that is opt-in (check this box if you want to donate your organs) or opt-out (check this box if you do not want to donate your organs). "We think we're rational," says economist John Gowdy of Rensselaer Polytechnic Institute in Troy, N.Y. "But really it's the person who designs the question on the back of a driver's license who made the choice for us."

Here's another example, from Customer Experience Matters, regarding the redesign of hospital crash carts. And Graphic Design Blender shares how graphic design changes in highway signs improved nighttime visibility and lead to faster reaction times.

Here's my question: does anyone else have specific examples of how excellent interaction design can be a force for good in people's lives?