The blue flag is a courtesy.
The marshal is charged to show flags relating to incidents between himself and the next marshal downtrack.
To show a blue flag he either has to be looking in the wrong direction or someone has to inform him that there is a blue flag situation occurring.
The only occasion when the marshal is free to look up track and see a blue flag situation arriving is when there are no karts in his sector, which may often be the case when you have novice back markers and the leaders coming round for the overtake, but won't apply if the novices have been overtaken by half the pack.
On a crowded track, say in the rain, you would need two marshals at each post, one to show the blue flag and one to sight for incidents. If the track licence allows single marshals, then blue flags become just an option.
On a practice track, speed difference is not something that should be legislated for. There are so many reasons for being slow, from running in the engine to practising rolling starts to simply positioning oneself so as to practice on one corner, or just having an engine problem. It should not be necessary to organise that this session will be run at speed X and this one at Y.
Even tracks that have allowed 'slow sessions" designed to separate the learner and seriously inexperienced have found people who will drive very much faster and claim that 'it was slow for me'.
Even F1 have found that the percentage rule isn't workable, has to be tempered by common sense. The same applies to karting.
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