[1] UMRA is often used as training ground for young go kart racers to gain open wheel skills before moving on to high level pro-racing formats.
[2] But UMRA racers are not all young: many are long time hobby drivers.
UMRA was the start of open wheel racing for NASCAR Driver Tony Stewart.
One such example was in 2000, when Tony Stewart returned to UMRA for a quick race before a Winston Cup test.
[4] As of 2008 the following eight drivers had United States Auto Club (USAC) and UMRA titles.