To measure the top speeds of any non-hybrid car, of which there are quite a few in this race. The issue is further complicated by the three cars not using the same energy strategies round the lap, so common speed traps are basically pointless for them as they will all reach their top speeds at different points.
LMP1-H are the exception in the way they make the lap times, almost all other cars follow the general convention of hitting their top speeds where before the braking zone of the longest straight ... which is where the speeds traps have typically been set since whenever they started being used.
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