Pretty much the way Slow Zones work in WEC. For a selected zone (at Silverstone generally about 5 flag points) code 80 applies, the rest of the track is clear. It's fairly effective. They mix and match this with full course Code 80 or Safety Car as deemed appropriate. Where SC is used, they seem to go FCY first and then put the SC out as the leader arrives.
40k is probably reasonable for club level on a normal circuit, for specialised vehicles it might need to be more. Crevantic 24hrs use Code 60 which I believe is also normal in Holland.
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