Clarksville, Tn UFO sighting.On 02/15/09 I left work in Springfield, Tn. I got on hwy 24 headed to Clarksville, Tn. Around exit 19 the car in front of me started slowing down. I looked up and saw two red lights and a green light off in the distance. The lights caught my attention because they were not moving. As I drove closer to the lights the craft got bigger and it was circular with red and green lights on it. It seemed to come down closer to us. The car in front of me pulled over, I kept going but every one around me was stopping and getting out. I kept driving as the craft got closer it was very big and dark silver the lights did not blink or it did not seem to move it was like it was standing still. I kept driving I looked up as I past it and it seemed to glow brighter. I drove past maybe seven cars stopped and people out of them or just sitting there watching. Since I was alone I did not stop. It was not a plane or helicopter. I have never seen a UFO or claimed to but this was one.