F1 Explains: Test + Reserve Drivers with Cadillac’s Colton Herta + Zhou Guanyu live in Miami

What’s the difference between a ‘Test Driver’ and a ‘Reserve Driver’? Well, who better to answer that than Cadillac Test Driver Colton Herta and Reserve Driver Zhou Guanyu?Colton and Zhou join Christian Hewgill ahead of Cadillac’s first home race in Miami to answer your questions about Formula 1.How does F2 compare to Colton’s previous career in IndyCar? What’s it like working with Valtteri Bottas and Sergio Perez? Who replaces a driver if they are injured or ill? How close is simulator performance to the real car? And why do drivers sometimes plunge themselves into ice baths after a race?Send your F1 questions to F1Explains@F1.comExperience F1 live in 2026Book your seat for a Grand Prix this season at tickets.formula1.comListen to more official F1 podcastsIn-depth interviews on F1 Beyond The GridExpert reaction before and after every Grand Prix on F1 Nation