
Cadillac have signed IndyCar star Colton Herta as an F1 test driver, with the American switching back to the European single-seater pyramid in the hope of an F1 seat in the future.
Herta, 25, has been linked with an F1 switch for a number of years and there was speculation that American team Cadillac could pick him as a home driver for their debut in the sport next year.