[All] Test the Track!

I like that you used a bridge to create a original route for the track. I however did not like the bridge it self. First it's ugly but secondly and more importantly it's really bumpy. You're getting waaaay too much airtime going over it, which is really bad when it's combined with a surface that only gives 80% traction. The entrance is awkward as well having a 90 angle on a straight. Consider changing the route or the position of the bridge so that you are going straight onto it. Also make it prettier so you feel like you're on a racing track

As you can see at 01:28 in my footage you need to place a checkpoint so people know where to go.

Consider not using diagonal barriers in your corners. If someone chokes and clip the barrier he'll be stuck on the racing line and possibly ruin the race for many others. Try to either use a prop that is more round, or create a template that creates a round corner.

The custom section at the end of the highway is really bad. You are going with full speed and is going into a 90 degree turn breaking on a barge with 80% traction, not a good combination. Maybe instead make a hairpin at the end of the highway straight and then make a straight bridge going onto the other highway lane.

The starting grid is too close to the first corner. Consider moving it back or changing the route to make it work. It's always weird to start out with a turn right after the start boost.