The A420 at Headington Hill, Oxford, has reopened in both directions following an earlier collision.
A female cyclist in her early 30s was injured after she collided with a lorry at the junction with Morrell Avenue at about 3.30pm today.
The road was closed in both directions following the crash.
A Thames Valley Police spokesman said the woman is in a critical condition at the city's John Radcliffe Hospital.
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