Tracked shells use smart rotating treads to work their way across surfaces that would bog down other ground vehicles. They can prop themselves up in order to overcome taller obstacles or to lay themselves down to bridge across a ditch or crevice. Similar Gear Gas Jet System Hopper Hovercraft Internal Rocket System Ionic Microlight Plasma Sail Implant Roller Rotorcraft Snake Submarine Thrust Vector Walker Wheeled Winged