Operating across the salt crust at Utah’s Bonneville Salt Flats, the 64-year-old former Royal Air Force pilot piloted a 32-foot (9.75-metre) vehicle developed by British industrial machinery maker JCB. "It’s magic to be able to showcase this technology and to showcase how good the engineering is on the best racing surface in the world, Bonneville Salt Flats," Green said after setting the new record. While pursuing his diesel mark, Green comfortably surpassed the prior hydrogen combustion record of 185.5 mph (298.5 kph). Formed from an ancient lake bed, the Bonneville Salt Flats lie roughly 100 miles (160 kilometres) west of Salt Lake City, positioned above a high water table that helps cool tyres. JCB has agreed a contract to procure green hydrogen produced via renewable sources, though this variant accounts for only a minor portion of worldwide production.