like a large high-voltage tower on its side, with lights, moving slowly

I was driving down the 805 freeway heading north of San Diego on my way to Rancho Santa Fe.  It was a wqarm summer evening so I'd taken the top off my car.  I was with a friend and we were in heavy traffic that was moving slowly as we approached the 5N merge.  
We both looked up and saw what looked like a huge high voltage tower on its side, moving very slowly, approximately twenty miles per hour through the sky toward the Calfornia coast.  It was several hundred feet above the freeway, but the sky was clear and we could see it plainly.  
The object made absolutely no noise.  It moved from east of us to the west.  We looked to see if anyone else say what we saw.  The object was very long, at least 200 feet.  You could see sky through the object as you would see through a metal upright tower.  The object had several round lights around the body of the structure.  
I did not report this to your office at the time because I didn't know of the existence of your service at the time.  However, I did call a radio station to see if anyone had reported the same siting.  The radio station said that no one had called and I did not give my name.  
This sighting was the second time in my life I had seen a UFO.  The other siting was approximately ten years earlier on a drive between Spokane WA and Grand Coulee Dam, WA.  The object was not similar to the one described above.  
Thank you and I hope you can shed some light on this unusual sighting.
 P.S. Has anyone else reported this kind of object?
Witness indicates that the date of the sighting event is approximate.  PD