J.G. Ballard really had a thing about cars...
I read Crash. It does not seem to be a one-off. I read The Drought (also called The Burning World) and cars also seem to be talismanic, funerary, even sexual, in that novel too: the sleek black hearse restored to perfection, at incredible effort in a post-apocalyptic hellscape, decked out in shining chromium (a Ballard word). The use of them as coffins in which to bury the dead, or sometimes, to find a meal - principally to feed a morbidly obese, scantily dressed, Venus-like figure. Etc.
I'll keep an eye out as I read some of his other books. I think it's interesting and kind of unique that he holds this fascination with them, even if Crash was a bit psycho.