We all have to do it but look at the background too! I positioned myself to see the poppy plot over the road and the cars aren't going that fast so it was not hard!
The background is blurred on a panning shot. You use a slow speed and when the car goes past fast you press the shutter down ans at the same time, swing the camera at the same speed as the car to follow it! It's fun particularly with motorbikes!
you did well.