I actually know one of the guys who runs the computer system at the Australian tracks, and have been to the track - compared to RC racing, there was an awful lot of running around in the computer area, heaps of manual adjustments and there are about 6 people involved. But at least, unlike RC, they generally have "real" transponders, with a rising/falling signal to have a better idea when a car actually crossed the line. It has always amazed me how in RC we assume transponders create some huge sense of accuracy, but at the end of the day we are just averaging the time in and out of the loop, could well be quite a few metres so we are assuming a uniform speed in all of that distance.