LIDAR for the finish, transponders for timing/lap scoring. Transponders solve a bunch of problems for a traveling series, speeds the show up, don't need several people hand scoring each lap and trying to figure out who was where and how many laps down, its impartial as well, no home cookin' by the track supplied human scorers, just one series official paying attention to a laptop. At 80 MPH one millisecond is 1.408 inches of distance, so if the loop ain't perpendicular to the track or the transponders aren't in the exact same spot in relation to the nose, we'll continue to see questionable 'visual' results. Oh, and the loops don't stay put where they were first put, that dirt moves around over a period of time.