animating a rolling road shot with trees

The next shot I started working on was a moving shot going down a road. I wanted to have trees moving past the camera with some parallax. I thought this shot would be relatively simple to do however I ran into problems fairly quickly with it. Before I tested it I thought lots separate layers moving at different speeds would work well to get parallax however the final result was rather disastrous. 

The trees moving too fast in conjunction with the foreground so it looks like the trees aren't attached to the floor. I needed to redo the scene composition completely to fix this problem. I made the road in the back ground a separate layer and made the foreground the same as the trees so there wasn't the same movement as the first attempt. I also carried out a lot of the motion using a camera rather than moving the layers them selves as this kept the overall composition whole whilst also providing parallax.