`   These are what I can answer but I will answer them separately to make it easier to clarify, correct me if I'm wrong  2nd line, if the driver is found not drifting, then that is considered as an understeer and that will be shown against him during a tsuiou round, if not, the driver will score a low point. On each corner, there is a corner judge, if they see a car appear to not drift at all or in an angle too shallow to be considered as drifting, then they raise a green flag which is for a judge to see.  3rd line, prior to 1995, it was upto the judges to decide and they always consisted of the three (Orido, Tsuchiya and Suzuki), since then Orido left and was ``replaced`` by a GPS device called the DriftBox which determines angle and speed  Last line, problem is , I have never seen lap times for the two together as I wish I can afford a subscription of Option, my guess is that with the style of drifting found in D1, it would be a somewhat slower than racing as the kind of drifting found in rallying is not as great as the former, but it more to go fast around tight corners.   `