I was driving home, headed southbound on Bayshore Blvd. approaching Gandy Blvd. driving 35mph. Approximately 6 or 7 streets north of Gandy, I witnessed three bright yellow circles or spheres shoot overhead, in formation. It caught my eyes as they moved like a fighter jet descending toward a landing strip in the distance. At first I didnt think anything of it since MacDill airforce base is located a few miles south from Gandy, in the direction I was headed. But the speed of these aircraft was much faster than when you see a plane flying overhead. Because of the oak trees that line Bayshore Blvd, my view was blocked for the next few streets until I turned onto Gandy. I really was interested to see the aircraft again, but there was nothing in the sky anywhere. I doubt these were military aircraft but I thought important to report this sighting of something that I suspect was UFO. I hope this is helpful.