A series for former Formula One drivers , called Grand Prix Masters , ran briefly in 2005 and 2006 .
Some drivers have gone to A1GP ( Narain Karthikeyan ) , and some , such as Gerhard Berger and Alain Prost , returned to F1 as team owners .
A series for former F1   drivers , called Grand Prix Masters , ran briefly in 2005 and 2006 .
Some drivers have gone to A1GP ( Narain Karthikeyan ) , and some , such as Gerhard Berger and Alain Prost , returned to F1 as team owners .