I was driving at night south of Parker, AZ, on Hwy 72, near Utting, AZ, and I saw a light on the left of the road I thought was blinking or obscured by trees. It seemed to stay the same distance from my car as I drove toward it, but finally after some distance I drove by it. When I looked in my rear view mirrors it seemed to be following my car staying at the same distance as I drove forward. Then I saw it turn into 3 blinking lights as if traveling up and down like an animated sign. Then the lights seem to turn toward me and get brighter all the while staying the same distance from my car. I got scared and did not stop to investigate and when I looked again the light had gone off