I read a short story at least 20 years ago, in which a man gets news that his son was killed on the highway while driving a starter car and responds by getting into his own tricked out car to duel the guy who killed the son. Dad was some kind of ace, IIRC. I thought it was by Norman Spinrad, but I've been looking for it and can't seem to find it.
"Why Johnny Can't Speed" by Alan Dean Foster. It's in a collection named "With Friends Like These" (1984).
Weaponized cars fighting on the freeways of SoCal in a dystopian future.
Kill flags stamped on the side of the car a la WW2 fighter planes. Offensive driving is the best defensive driving.
Now I want to reread it.