Hey these look nice! But the vertical cars have a top down perspective and the hoizontal cars have an isometric perspective, which doesnt fit together. One is 2D, the other 3D. I bet it's a lot of work to make 3D "up" and "down" sprites for every car, but I'm sure you'd learn and improve yor skills a good bit by doing so.
Also I think a diagonal sprite would be needed too, so that when the car turns the animation is less jerky.