Formula 1 commentator Eddie Jordan and German racing driver Sabine Schmitz are to join the new series of Top Gear.
Motor journalist Chris Harris and TV presenter Rory Reid have also been signed to co-present the programme.
They will join DJ Chris Evans and actor Matt LeBlanc when the BBC Two programme returns in May.
The new presenters were signed after Jeremy Clarkson, James May and Richard Hammond left the programme last year.
Sabine Schmitz will become the show's first female presenter in 15 years.
Speaking about her new role, Schmitz said "The chance to combine both driving and filming was too good an opportunity to pass up".
"I've appeared on Top Gear a few times in the past, so I know we're going to have a lot of fun," she added.