http://FutureFordofSacramento.com 866-699-7684 Whether the road is filled with gravel, covered with ice or soaked by rain, the easy-to-use, shift-on-the-fly Intelligent 4WD System on the 2012 Explorer helps provide sure-footed traction. Intelligent 4WD is fully automatic, instantly delivering traction to the wheels with the most traction when wheel slip is detected. Working in concert with the 4WD System is the Terrain Management System, which allows you to easily shift on the fly into one of four settings to match the terrain you’re driving in. Take your pick of Normal, Mud/Ruts, Sand or Grass/Gravel/Snow.