I stumbled on these videos this morning of a guy who bought the old Copper Creek Motorsports Park near Superior, MI and is fixing it up. Track doesn’t look too bad for being abandoned for 10 or so years. It might be some option for local kart racing for people near there.
No, I still don’t understand drifting - but it does put some rubber down I guess.
Usually this style of turns are seen on dirt. We have several dirt tracks locally that have that shape. One even calls itself “The D shaped Dirt Demon”.