2001 Hummer (later called H1) One Vehicles Barrier is Anothers On-Ramp Sales Brochure. One vehicle's barrier is another vehicles on-ramp. Most 4x4s' off-road success is 50 percent machine and 50 percent driver ability. The HUMMER's prowess is more like 90 percent machine and 10 percent driver because of its off-road features and abilities. Each is a stand-alone feat of engineering. Goes on to highlight some of the features, such as the suspension system, central tire inflation system, and TorqTrac 4. Back has specifications and performance data, components and features, standard and optional equipment, as well as lists exterior and interior colors.