2019-09-18 - Nashville, TN - Unknown

I was driving into work westbound on Briley Parkway. About a qtr mile from the whites creek pike exit I noticed 3 or 4 solid green lights and a blinking red light Southwest if Briley hanging at a low altitude. At first I thought maybe it was a large radio tower that I’d never noticed before, but I was confused by that idea due to the distance between the lights. As I took the Whites Creek Pike exit I realized that the lights were moving northward in unison. Once I stopped at end of the exit I was able to stare at the object for maybe 10 seconds before it was nearly out of sight over the tree line. I only thought to record at the last second. I have a few seconds of footage to share if anyone is interested. After reviewing the video the craft appears to be triangle shaped with the blinking red light at the rear.