Yeah, fgh is correct.. we did this (or similar) for BC Racers
There were marker "strips" of floor blocks around the track... it you passed through them in sequence, and then cross the finish line (final marker), then a lap is completed.
We also used them for another reason, but can't remember exactly what it was... oh yes.. it's come back to me... can work out the position of each car, 1st,2nd,3rd to a reasonably reliable degree during the race
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