Building a circuit for spectators you end up with Ricardo Tormo at Valencia, a stadium circuit, that is fine for Bikes and maybe lesser 4 wheel categories, but is too tight to let "big circuit cars" race on.
Designing even a stadium section of a larger track is easy as it inevitably breaks up the flow of the circuit or is little more than a hairpin with horseshoe grandstands (Hockenheim).
I tend to think of the types of corner I want (or over taking points), and then how I'd link them...straights, arcing curves, long esses etc. I usually re-design of atleast 2/3 of it (usually more than once), as I'll only be happy with the flow in parts. Where Granndstands etc then go would fit naturally around the circuit that point.
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