I was returning from the movies heading north on hwy 319 between Killearn and Bradfordville Rd. in north Tallahassee. I was sober and I had my top down and was cruising about 45 miles per hour. I am 60 years old and retired from the US Postal Service. I have worked on air force bases and am familiar with all types of flying vehicles. It was dark and partly cloudy. I looked up a noticed in front of me to my right a huge triangle in the sky just above the trees. There are a lot of trees along this stretch of road with a few clearings here and there. At first I thought it was a triangular cell tower because they have three white lights and a red light above them in the middle.As I drove a little futher it was in a clearing and I could clearly see it wans't a tower. The lights on the ends appeared to be triangular to form the ends and lighted from the inside. What I don't understand is the huge slowly pulsating red domed light in the bottom middle of the craft. It was slowly heading in a southerly direction away from me.After I saw it I tried to turn into a street to take a picture if I could but some jerk was right behind me and I couldn't turn in. As I went to the next block I knew it was of no avail for me to try to turn because too much distance between the object and me.A couple of days later I inspected my route in the daytime and again at night. I never saw any tower except a radio tower a few miles north. This object was to my immediate right and heading behind me. No sound, no props, no jets, and no descending, just slow and steady movement.I was bewildered because I have never seen such a thing. I have heard of these sightings and always dismissed them as experimental aircraft. Now that I have seen this and how it moved I know I was wrong in that judgement. This craft was impressive in size and spooky to me!