Female racing driver Maria de Villota has been seriously injured after her car collided with a lorry during testing.
The test driver for the Marussia F1 team was rushed to hospital following the accident at Duxford Airfield on Tuesday morning.
The crash with the team's support truck is said to have happened at low speed after Villota pulled off the track following a lap during which she reached speeds of about 200mph.
The crash happened at the start of two days of Formula 1 testing at the site.
In a statement, a spokesman for Marussia said: "At approximately 09.15am, the Marussia F1 Team's test driver, Maria De Villota, had an accident in the team's MR-01 race car at Duxford Airfield where she was testing the car for the first time.
"The accident happened at the end of her first installation run and involved an impact with the team's support truck.
"Maria has been transferred to hospital. Once her medical condition has been assessed, a further statement will be issued."
Cambridgeshire Police said a woman, believed to be the 32-year-old, originally from Madrid, suffered serious injuries.
McLaren F1 driver Jenson Button wrote on his Twitter account: "Terrible accident For Maria de Villota, Marussia F1 team test driver. My thoughts are with Maria and her family at this very difficult time."
This year is the first season the team has competed under the name of Marussia, after the Russian sports car manufacturer bought a controlling stake in the former Virgin team.
Timo Glock and Charles Pic drive for its Formula 1 team, which is yet to score any points this season.
Villota is the daughter of retired F1 driver Emilio de Villota.