tho' I'm not a fan of ovals, I understand their nature, I was on Indy motoGP this year, Liked the layout but most people tend to design keeping the oval shape and making a small infield at each end(like Indy) I'd like to roll a different approach , avoiding the big turns(no run-off for motorcycles) and having a rather horseshoe approach,something like this:
I purposely broke up the left carrousel into a slower set of chicanes,so we bikers are not facing a wall @ triple digit speeds and dragging elbow,used up a nice portion of the upper straight, then balanced with some lefts,so that it's not a perpetual circle(boring) and tried to exit back to the oval with a shallow angled turn,avoiding too much side force against the oval wall.
Maybe the plan can be reversed if it's nesesary.