I would like to suggest adding Lap Count information to the serial output instructions.
[LCnn0] lane nn has zero laps completed. Could be sent at start of race when car crosses S/F line.
nn = 00 to reset all lanes to zero.
[LCnn1] lane nn has completed a lap (increment lap count).
If there is need/method to impose penalty, could use [LCnn2] as penalty (decrement lap count).