I find that the time that is registered is the time that a car is stopped. I think it should be the time that the maximum score is reached.
For example, in the Sisyphus run, I have two cars who reach identical height in the same time. However, one of them slows down to a stop. The other leaves the track, never stopping, and falls down. The time registered is the time the algorithm decides to take the car out of the race. The first car has time .26 and the second .42. They should both register the same time.