This reminds me of old-school arcade racing games, and TrackMania in equal measure. :-) Nicely done.
A few observations for potential improvement:
- If it's an option in WebGL, I'd suggest locking or hiding / locking the mouse cursor once it's held on the steering wheel, show it when released. I dragged it out of the window and lost steering.
- Keyboard steering is a bit twitchy. Could probably use some smoothing or easing?
- On Track 1, the camera stops following the track on a left hand turn on the way to Checkpoint 4.