Installation of Las Vegas Motor Speedway¿s Steel and Foam Energy Reduction (SAFER) barrier got under way Monday as construction crews braved the July desert heat. The process, which will take about three weeks to complete, will have the barriers in place for the upcoming Las Vegas 350 NASCAR Craftsman Truck and Champ Car World Series doubleheader on Sept. 25. The SAFER barrier system is made up of steel tubes and pads of hard foam that are affixed to a speedway¿s concrete walls to absorb some of the energy that is transferred during a crash. The SAFER wall project began in the fall of 2000 and remains an ongoing safety initiative among NASCAR, Dr. Dean Sicking and the Midwest Roadside Safety Facility at the University of Nebraska. Based on measurements by engineers, Las Vegas Motor Speedway will install 6,107 linear feet of the SAFER barrier, covering approximately 75 percent of the speedway¿s outer walls. The SAFER barrier system will be placed outside of all four turns as well as most of the front straightaway.