Police are appealing for dashcam footage after crash on the A595.
The collision happened at about 4.25pm on Wednesday, October 31 on the southbound carriageway of the Distington bypass.
Officers want to trace the driver of a white vehicle which was in the area at the time.
Anyone who was in the area around the time and may have dashcam footage is asked to contact PC 2664 McKenna of Cumbria police on 101 or email 101@cumbria.police.uk, quoting log 164 of October 31.
Alternatively, call Crimestoppers anonymously on 0800 555 111.
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