I would set the focus on Continuous focus and the camera will follow the subject as it moves and keep it in focus. Another method that I use in car and bike races, is to manually focus on a spot in the road that I know that they will be passion, and set up the exposure for that scene. I then face the spot so that my body is parallel to that position and is stable. then keeping my feet placed forward, I rotate my body to where the vehicle is coming, and I am in a somewhat unstable position. then keeping my camera rangefinder spot on the persons head I follow their action until just before my stable spot and press the shutter button. Of course, you can do the same thing using the burst mode. Another way is to press the shutter button down half way on you selected spot, locking the focus and exposure, then rotating your body as before to see the vehicle coming, and they depress the shutter button the rest of the ay when you are pointed in the forward direction. don't forget to follow through in your panning action.

The 80-400 does not have a focusing motor and so the camera must have a focusing motor to allow auto focus to occur. The D3200 does not have a focusing motor, so this lens does not autofocus on the D3200. All metering and exposure functions work fine with this lens on the D3200. The only limitation is the autofocus.