You guys did a pretty nice job on the update. Congrats.
Now... the next thing we need to work with you on is creating and adding a more realistic looking nighttime environment, with proper shadowing, shading and darkening of the objects, horizons, walls, etc. in and around the track to make a more realistic looking and immersive nighttime atmosphere. Right now, everything around the track show daytime mips. These all need to be darkened and shaded.
Otherwise, nice job on your first foray into track editing. :)