How to create a curve road for the racing game?

I’m creating the drift game. And I want to create racing tracks (like on image below) right in the creator editor .

So, there few questions:

  • How to create a track in the editor? I haven’t found any embedded curve editor.
  • If I can draw a curve, how I can fill it with the asphalt texture?
  • How can I make a curved colliders for the walls? I need to track if a crash happened.

Sounds like you need more than just the editor. this looks like its been done with graphic editing software and then imported the track as an JPEG or PNG and then with the editor added the different collisions like the PolygonCollider2D component, which allows you to make curved colliders.