How to determine Drag Racing winner?

There are two types of drag racing. First off there is what is called a pro start, or pro tree. Those classes are run heads up, start out even, and barring a red light, starting too soon, or before the green light comes on, the first to the finish line wins. The other type is called bracket racing. You make a couple of passes to see what your car runs, et wise. Then, you put a time on the windshield. It is a time that is close to what you run. Not too much faster, because that time determines how much of a headstart either car gets. But, not too slow, because if you go faster than that time, you break out, and are disqualified. Consistency is the key to bracket racing.