Assetto Corsa is a VERY realistic racing game that's in development:
http://www.assettocorsa.net/en/
And if you're interested in bus simulators, I suggest OMSI Bus Simulator 1 and 2. It is THE MOST realistic (physics-wise, not graphics-wise) driving game out there. Every button on the dashboard works and the physics are unbelievable. I never thought a game could feel (and sound) this realistic before. Here's a video:
https://www.youtube.com/watch?v=5PKgYV_W_SA
NerdCubed (my favorite YouTuber) is a bit derpy and can't drive in real life, but even HE suggests it. Oh, and OMSI has a very nice map editor/creator and a huge modding community.
Hope this helps