For the first three years of its existence, the Indy Pro Series was contested on oval tracks only. This was also true of the parent IndyCar Series, at the time. All Indy Pro Series races were run as support to IndyCar Series events. Road course and street course events were added to both series in 2005.
In that year, the series added the Liberty Challenge, as a support race to the Formula One United States Grand Prix at Indianapolis. This move allowed the Indy Pro Series drivers valuable exposure in front of the Formula One teams and fans. Some drivers, such as Graham Rahal, ran this race as a one-off, while running other series (such as the Champ Car Atlantics).
The Liberty Challenge was the only Indy Pro race at the time which was not run as support to an IndyCar Series contest. Also, the Indy Pro Series became the only racing series to hold races on both the oval and road course tracks at the Indianapolis Motor Speedway. In 2007, a twin race format was utilized.
Read more about this topic: Liberty Challenge
Other articles related to "race history, race, races":
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