A woman taken to hospital after a car crash in central Christchurch today has no memory of the smash.

The woman's small green Ford collided with a black Mitsubishi Mirage at the Barbadoes-Hereford Sts intersection at 11.37am.

The woman driver was taken to hospital by St John with moderate injuries.

Her boyfriend said she was on her way home from work when the crash happened. She told him she "doesn't remember anything".

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She had an injured shoulder and was probably in shock, he said at the scene.

Both cars were badly damaged.

The busy roads were down to one lane briefly.

Police are investigating.