Andy Green set a record for the fastest land speed driving a JCB Hydromax on Tuesday at 406.320 miles per hour. The hydrogen-fueled internal-combustion vehicle took about 72 seconds to get from 50 miles per hour to 400. At 64, Green is the only person to break the sound barrier on land, driving a jet-powered car at an average speed of 763.035 miles per hour in 1997. The JCB Hydromax was not built to rival that record, but to set a new fastest speed for a hydrogen vehicle - the previous record for a hydrogen combustion vehicle was 185.5 miles per hour, set in 2004 by the BMW H2R.