Oh, and here's a thought on the tired old howlongisthecourse topic. It is, of course a different length for each rider, as they all take different lines... sometimes different lines every lap.
SO, set up the transponders so they record the distance travelled as well as the lap speeds. The lap would be from startline to finish, but the length would vary. Every rider would design her/his own course, and hold the lap record for it.