trange lights playing tagg

This happened in Houston close to downtown on 45 north and Main street while I was at the light.I was looking up like always when all the sudden I see 2 bright white ambulance type color lights in midar on my left side facing south.So I basically have downtown in front. The height was not many feet since they were noticable.There was no shape it was just lights.One would go up the other would follow,then across then it would follow like if they were playing tagg.I saw them for a few seconds because my aunt was in the front with her car and panic because i kept honking and pointing up but the light turned green and she was unable to see, although we did stop on the other side of the road which would be going north. I told her what had happen.