as far I've been told by le mans residents, 24H le mans track is basically made of first section of bugatti circuit, extended further after dunlop chicane to tetre rouge entry + main state/regional road from tetre rouge to mulsanne corner + extra urban road from mulsanne corner to the entry of porsche sector + porsche sector to ford chicanes to get inside again circuit bugatti. Porsche sectors and the segment between dunlop chicane to tetre rouge are bugatti circuit private roads sometimes open, sometimes closed to traffic.
Monza track made of f1 track + inner layouts and the old oval is in the middle of monza park, a lot of times in the recent past there have been proposals to add more grandstands or change the layout (the last one back in 2017 or 2018 with a modified and slower curva grande) but since monza park and track is a critical asset for regional tourism, the situation is an eternal impasse because of huge political and economical interests involved.
Albert park is made of road streets around albert park lake.
Until early '00 even spa was a not permanent track with segment of the track from blanchimont to kammel straight made of public roads. Since 2007 after the restyling is a full private circuit.
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