PHILADELPHIA -- Less than 30 percent of the continental United States is within one-hour travel distance from a high-level hospital trauma center. In the world of emergency care, that's known as the "golden hour." Serious injury victims who reach an ER within those 60 minutes have a much higher survival rate than those who don't. This five-minute video featuring the University of Pennsylvania's Dr. Brendan Carr, details a research project that has created an online, interactive national map enabling any one to see which locations across the country are within golden-hour distance of a trauma center and which are not. This is a joint project of the University's Cartographic Modeling Lab, the American Trauma Society, and the Centers for Disease Control and Prevention.