Mistaken identity? Helicopter? Ball of light, turns into Alien aircraft and shoots into space!

One night after I got off of work as I was heading back home from downtown Pensacola and heading east on Cervantes Avenue at one point I noticed a bright light shining down upon my car and so I looked up through my windshield and then out the side window to see a bright light which I took to be a helicopter although I did not hear the noise and as the traffic light changed I drove about 2 miles to have this vehicle follow me with its spotlight on me and just after I crossed Bayou Texar and got to the next traffic light, I stopped on the red light and still watching from through the window by sticking my head out because the craft was literally straight up.  Anyway, As I stopped at the traffic light I watched the craft above me stop. Then it shot very quickly to a point further east and stopped there for a brief moment, before it then shot into outer space at a very rapid pace if not faster than the speed of light.  A light trail followed it briefly before it t! otally disappeared.