Please use Flash to create the animation.
Use this car:
And use this background:
Add the background, then create a new layer (lock the background layer).
Draw the road, then lock the road layer.
Add a new layer and paste the car. If there is a white box around it, you will have to go to Fireworks, paste the car, select the background, and delete it. Then copy the car and paste it into your Flash file.
In Flash, select the car and make it a Movie Clip symbol.
Add a frame (not a KeyFrame) at frame 40. Add a motion tween. Move the car
Adjust the motion tween to make it look natural. (hint: use more than one key frame)