I didn't really get how the game is supposed to fit the theme, beyond the cars steering in two directions.
Gameplay is fun, chaotic to try and get the cars where they need to be. A suggestion would be to have the spawn points not be right on top of some of the end points, as you could get to the correct location just to have a car spawn right in front of you at the last moment. Utilizing the sides of the roads could be a good way to incorporate that into the game.