Riff Racer (previously known as Drive Any Track) had Steam trading card support added on 19 June 2015. There are 9 cards in the series, and you'll receive 5 cards at random for purchasing and playing the game.
Trading Cards
Comet
Inferno
Deauville
Ghost
Harrington
Pulse
Razor
Rocket
Scrugg
Foil Cards
Comet
Inferno
Deauville
Ghost
Harrington
Pulse
Razor
Rocket
Scrugg
Badges
Booster Pack
Emoticons
Profile Backgrounds