If you're fed up of bad road design then this might be your chance to start making roads yourself! Solve the puzzles by fixing the roads and allowing the cars to pass through the end of each level.
If you're a fan of this style of thinking game you might also enjoy HeliCrane, Amigo Pancho 5: Artic & Peru or maybe even the greusome Rock Vs Zombies. And if you're just looking for some more games that involve some thought head on over to the HAG Physics archives to find more of the same.