Emergency services were called to Redbourn Road in St Albans at 9.10am following a collision.
Three vehicles were involved - a Skoda Octavia, Ford Fiesta and a Nissan Qashqai - leaving the road blocked.
A woman in her 30s was taken to Luton and Dunstable Hospital as a precaution.
The incident was dealt with by 10.40am.
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