Rubens Barrichello is about to become the latest Formula 1 driver to attempt to reinvent himself in the world of US open-wheelers when he makes his IndyCar Series debut at St Petersburg this weekend.
AUTOSPORT decided to trawl through the archives to find the top 20 drivers from history that have made the same move, albeit with varying degrees of success.
1. Emerson Fittipaldi
The vast majority of professional drivers would dream of achieving either half of Emerson Fittipaldi's career. An 11-season stint in F1 between 1970-80 left him with two world championships (1972 and '74), and runner-up on two other occasions, and he still found time to start his own team and occasionally fail to qualify. A four-year sabbatical followed his retirement from F1, after which he decided to switch to Champ Car at the age of 38. Once he settled in, he became a force - the first of his 22 wins came at Michigan in 1985 and he lifted the title four years later in a Patrick Racing-run Penske. Along the way, he also managed to win the Indianapolis 500 in '89 and '93. The second Indy win came at the expense of Nigel Mansell, from whom he took the lead on lap 185, although he managed to trigger an uproar afterwards when he eschewed the traditional victory milk in favour of orange juice (he had an interest in some orange groves in Brazil). His Champ Car career ended at 49 years of age when he was injured in a crash at Michigan in '96.