The racing series RCN Rundstrecken-Challenge Nuerburgring (Circuit Challenge Nuerburgring - formerly Castrol Haugg Cup) is GermanyŽs oldest series for touring car racing. The Circuit Challenge is a Performance test. This means that the racing vehicles are started behind each other with an interval of 5 seconds. Each car will be counted separately. The total distance is 313 km and is therefore larger than a Formula 1 Grand Prix. Events typically have many classes which allow almost any vehicle, from economy sedans to purpose-built vehicles, to compete.
RCN Rundstrecken-Challenge races are mainly held on the Nuerburgring-Nordschleife.