Question about Collison?

We are currently working on a racing game, For that we made a track but the thing is we are having problems with the collision (please refer to the uploaded .c3p).

Google Drive Link :

drive.google.com/open

You have the Ground object's collision mask set to bounding box, rather than Collision Polygon.

You have the Ground object's collision mask set to bounding box, rather than Collision Polygon.

It obviously not the solution.Please help!

It obviously is the solution. Configure the collision polygon correctly in the sprite and in Physics settings.

It obviously is the solution. Configure the collision polygon correctly in the sprite and in Physics settings.

Thanks for your response.I tried using collison polygon but it was not working as expected.

Please help!

dropbox.com/s/7qtndtsf7ccgbz4/Track%20Answer.c3p

Of course you need to put more effort into building the ground. Create it from many separate sprites with smooth collision polygons, maybe set collision mask for some of them to circle.