Well, as far as I can tell then neither DF nor Car Wars have evolved much since back in the day. Both of them are still rather 'clunky' in their design, and neither of them allow for tabletop gaming with terrain - well, unless you'd build the highway from DF in scale terrain
However, seeing as the Post-Apocalypse is a genre very near and dear to my heart then I'd like to present a couple of online freebie games that I've found in my search for anything post-apocalyptic:
Axle and Alloys which should be one of the best car war tabletop games out there. I have yet to play it, but it does look promising. Oh, and it's free as well - can't beat the price
Otherwise I also found this little
homebrew over on the Drunkdwarves homepage. It looks like a fun little game, as does this homebrew:
Road WarriorsFinally, I've personally made some modifications for the
No Limits wargame called, funnily enough,
Road Warriors - but I'm not sure that it is what you are looking for as the game was designed around a campaign game with small gang-skirmishes and the occasional road war.
Anyway - hope these links will help you out in deciding for a post-apoc-car-mayhem game