Those with long memories may remember that at one time Games Workshop produced a 20mm near future Car Wars style game called Dark Future. In which armed and armoured cars fought each other over the open road.
The game came with a selection of plastic vehicles and some were on display at Warhammer World.
When the game was been promoted in White Dwarf there were lots of articles on how to convert Matchbox cars for use with Dark Future.
I really did like the concept and the metal miniatures which were also produced for the game, but though I admit I preferred the Car Wars rules.