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Arie Luyendykbocht (last corner before the main straight) → ~18° banking (32%). This is the most famous banked corner at Zandvoort. 

Hugenholtzbocht (Turn 3, a tight hairpin) → up to ~19° banking (33%). This is also heavily banked, even a touch steeper than the final corner. 

Technically, both have extreme banking, but when people talk about the “18° iconic banking”, they almost always mean Arie Luyendykbocht, because it’s the one leading onto the start/finish straight and makes the biggest impact in racing.