Alongside his open-wheel success, Herta has also competed in sports cars, winning IMSA’s 24 Hours of Daytona twice and adding outright victory at the 12 Hours of Sebring in 2024.
Herta joins Cadillac F1 under the wider TWG Motorsports umbrella (which includes Andretti), and his appointment follows last month’s announcement that Bottas and Perez will form the team’s inaugural race driver line-up.
“I’m incredibly excited to be joining Cadillac as a test driver,” Herta said. “This is a dream opportunity, and one I’ve been working towards for a long time.
“To be part of Cadillac F1’s entry at such a pivotal time is something I couldn’t pass up.
“My dream has always been to race in Formula 1, and I see this move as a huge step towards that goal. For now, my focus is on giving everything I can to Cadillac F1, helping build a competitive team.”
Team principal Graeme Lowdon described the move as a milestone moment for the American project.
“Colton is an exceptionally talented racer with proven speed, racecraft, and maturity well beyond his years. Having an American driver join an American Formula 1 team is a hugely significant moment, not only for our team, but for American motor sport as a whole.”