Hovered- Colored lights went out- sped away -left trail

This was a long time ago, but it is still fresh in my mind. I saw a red and green light over the mountain where there is a christmas star that is turned on for the holiday.  Upon driving north on rout 171 in Simpson Pa, I saw the red light move over the highway.  
I drove over the bridge going home and saw a number of cars onthe side of the road.  There was at least 10 people watching this.  I stopped and got out of my car, we were all watching the lights moving over the road.  The lights stopped and they hovered for about 2 minutes.  
Then the red and green lights went out and a bright white appered inthe middle and sped off.  It left a trail of white light behind it, because is moved so fast. 
I dont know if this means anything, but it was something that i will never forget.
Source of report indicates that the date of the incident is approximate.  PD