by filling in the sides of the structure I'd say that you have more of a tunnel than a bridge in a Motegi fashion (Motegi of course passes under the oval).
My only concern is the way the run off pinches in at the bridge and then runs parallel with the track through the tunnel.
I wonder whether more of the structure could be cut away, giving a slightly longer bridge span (tunnel entry), allowing the run off to continue at a wider angle. It looks as though it would match the current tunnel exit so this wouldn't need to be adjusted.
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