Me and my familly were driving from Florida to New Jersey,we missed the exit ,and to go back to rt95 north ,we got on rt 121 north ,the road was dark ,not many cars were passing through.From miles we saw that the sky in front was lighting up for a moment than stopped.I am an electrical eng. and I am aware of diferent variety of light ,but to me this looked ,much different than anything I have seen before.As we were getting closer to the source of the light,(like 15-20 miles ) to get on rt 10 east,very bright blue white light ,was above the trees ,than I thought that is some kind of light ,maybe from some kind of signalization .But the light was above my car ,so was moving along with my car ,than we realized that the light is not stationery,and was moving along.Mu wife got scared,my kids were asleep on the back seat.This was lasting for 2-3 minutes ,than we saw in the back ,the light stayed behind ,and was flashing .I do not know what was it! Than we looked on the internet ,that someone had the same experience ,as we did have,three years ago ,on the same road.Someone was trying to explain ,that there is an airoport and penetentiary ,close by ,and that could be ,an airport light or airplane ,or the prison guard are mapping the area with light ,to check for escaped prisoners.I do not believe any of this ,the light was moving along with our car ,I could not see the shape, because the light was very strong ,and bright white ,sometimes like light blue ,and was sinhronized with the speed of our car. I wil go back again ,but this time alone ,if I was by my self , I was going to stop ,and see what is it,but beeing with two small kids ,I was scare to stop!