Mary-Anne Wykes and Lewis Cook, both aged 16, and Genevieve Reason aged 32, all died at the scene.
Two men managed to escape from the car which caught fire after the collision.
Ms Reason, a mother of two from Deerwalk, Woburn Sands, was driving the Audi when it collided with a lorry near Sheeptick End, Lidlington.
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Mary-Anne lived at Murfitt Way in Gamlingay and Lewis was from Deacon Mews in Marston Moretaine.
Both teenagers attended Wootton Upper School.
Adjourning the inquest until January 12, 2016 Senior coroner for Bedfordshire and Luton Tom Osborne expressed his condolences for “the sad and tragic circumstances of the deaths of all three people.”