A man aged in his 60s from Manchester was arrested on suspicion of drink-driving after a young woman was seriously injured in a collision.
The woman, who police said is aged in her 20s, was rushed to hospital with what police called 'serious injuries'.
Police said she was a passenger in a Toyota that was 'struck from behind' by a Mercedes C220 that was 'driving in the same direction' on a busy bypass. Both cars ended up on a grass verge and the Toyota landed on its roof, said police.
The man from Manchester, who hasn't been named, was also arrested on suspicion of causing serious injury by dangerous driving.
He remain in police custody for questioning on Friday night, said Lancashire Police. The Toyota driver, a man in his 40s, suffered 'more minor injuries', the force added. The collision happened in Accrington, Lancashire, at 8pm on Thursday night.
In a statement, police said: "We are appealing for witnesses after a woman was left with serious injuries following a collision.

"The collision happened on the A56 Accrington Easterly Bypass at shortly before 8pm on Thursday when a Toyota CH-R travelling north approached the roundabout at junction eight when it was struck from behind by a Mercedes C220 driving in the same direction.
"Both vehicles ended up on the grass with the Toyota landing on its roof. The passenger of the Toyota, a woman in her 20s from Nelson, suffered serious injuries and was taken to hospital.
"The driver of the Toyota, a man in his 40s from Nelson, suffered more minor injuries. The driver of the Mercedes, a man in his 60s from Manchester, was arrested on suspicion of drink driving and causing serious injury by dangerous driving. He remains in custody.
Sergeant Craig Booth, of the Serious Collision Investigation Unit, said: "This collision has left a woman with some really serious injuries and I would appeal for any witnesses who have not yet spoken to police, or anyone who may have dashcam footage, to get in touch with us."
Contact police on 101 quoting log 1183 of October 13.
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