There are multiple definitions - click on the translation that matches your context.

culpa concorrente

substantivo

full

comparative fault

Definitions of comparative fault

US tort law a defense that prevents a claimant from being awarded full damages if he or she did not take reasonable care of his or her self. The award for damages will be reduced according to the claimant's share of responsibility for the loss or injury.

The second element of comparative fault is causation-that wearing a helmet would have made a difference.