Ultimately, if a fault issue is contested, a jury makes a decision on that issue. You have the classic green light, red light where one person says, "I had the green light." The other person says, "I had the green light. You had the red light." If you only have two people saying that, you're going to put that in front of a jury and they're going to judge your credibility and make a decision as to who's at fault. The jury can also have a compromise. They don't have to find one side's totally at fault or the other isn't. They can do 50/50, 80/20 or any variation as long as the totals 100% of the liability.