I remember this game made before the 2010s… It had these crazy cars and wild tracks. You could switch between different vehicles, and everything had this bright, neon, RGB vibe. The tracks had loops, anti-gravity sections, and you could go super fast. It felt somewhat open-world, and you could smash into other cars.
Was also going to mention Distance and Blur, but Blur is more like neon-colored Mario Kart, but with real cars.
Nitronic Rush? I remember reading Distance was a spiritual successor to it, and wikipedia backs up that thougbt