What is the test for joint and several liability in a motor vehicle accident?

22 In California, as in many states, statutory modifications have been made to the doctrine of joint and several liability. Liability among concurrent tortfeasors for noneconomic damages is now several--proportionate to fault, not joint. (Civ.Code, 1431.2, subd. (a).) The purpose of this change was to eliminate the unfairness of requiring a tortfeasor who was minimally culpable to bear all of the plaintiff's damages when the more culpable tortfeasor became insolvent. (Evangelatos v. Superior Court (1988) 44 Cal.3d 1188, 1198, 246 Cal.Rptr. 629, 753 P.2d 585.)