Sober drivers may share liability if their negligence contributed to collision severity despite other driver intoxication. Failure to maintain proper lookout, speeding, or traffic violations can establish partial fault. Comparative negligence principles apply even with drunk driver involvement. Last clear chance doctrine may shift liability if sober driver could have avoided impact. Insurance companies argue both drivers’ contributions. DUI doesn’t automatically absolve other parties. Sober driver’s defensive driving failures examined. Multiple impacts complicate causation. Punitive damages typically reserved for drunk driver only.