We have made a short video showing some test driving in an early prototype of the game. This is with unfinished untuned car physics and a basic road with some scenery. It’s basically a small test track where we can try out and test various ideas and game features to see what works and what does not work.
We also use this as a sandbox to test shaders and other graphics related things. Keeping an eye on performance is also important so we use it to test how much stuff we can put into the scenery, both in terms of object count and polygon count. This will then later help us design good looking and well performing tracks.