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The collision happened on the A4 London Road at 6pm on August 4.
A Kia Picanto, Volkswagen Tiguan and a Volkswagen Polo were involved in the collision.
The driver of the Kia, a woman in her 60s, sustained suspected fractures to her spine and pelvis and was taken to the Royal United Hospital in Bath.
We’d like to hear from anyone who witnessed the collision who has not already spoken to police, as well as anyone who may have dash cam footage which could be relevant to our investigation.
If you can help, call 101 and quote crime reference number 54220082207. Alternatively, call Crimestoppers anonymously on 0800 555 111.