4 lights in square formation in Columbia, TN

At approximately 9 p.m. on Saturday, October 31, 2015, my daughter and I were driving south on Hwy 43 towards Columbia, TN, when we saw 4 bright lights in the sky on the driver’s side of the car.  They were approximately 50 feet in the air.  
At first we thought they were lighting up a haunted attraction for Halloween, but after looking a bit longer, we noticed there were points of more concentrated lights at each corner, so the light source was coming from above, not the ground.  They maintained a square shape, and looked like 4 lights, but occasionally a light would travel from one corner to another in a random fashion, so there may have been as many as 8 lights total.  
They were ahead of us at first on the left, but as we approached the main intersection of Hwy 43 with Hwy 31 the lights were keeping pace with us.  My daughter snapped a couple of photos with her phone.  
We crossed the intersection and the lights were still pacing us, as they continued to do for se! veral more miles.  
Then I looked back over and they were not there.  We were relieved, but a few minutes later they were slightly ahead of us, kept pace for at least 5 more miles, then disappeared.