I remember reading on this forum about this very twisty road in Oregon. It was on flat land and near the ocean. It was paved and had grass around it. Basically it looked kinda like a giant non looped go cart track type thing (lots of unnecessary turns) If I recall correctly it was closed to the public and only opened up on special events such as car shows. Does this ring any bells? I wanted to go check it out. Couldn't find anything on google or through the search function.