Hell Park 01 12 - Line Over

Welcome to this short but confusing Hell Park.

In this Hell Park, you discover a Line Over, as you jump over a line you are not supposed to drive on!

Also, the ice ramp jump isn't hard, but it definitely is harder frontward.

Also, don't go in the tunnel!
Why are people going in the tunnel? It is blocked by items and by signs but it looks like people are still uncontrallably drawn to it.
Was it really necessary to include a dynamic ad campaing in the map to explain this to players?
It looks like it was...

Also, Snow has a really strange physic, I don't know what to think of it.