30ft dia ,slow rotating disc, on top of seperate faster rotating triangle- Seen at close range in California.

Driving to Northern California, heading North on Interstate 5, just past the Hwy166 juntion(approx 1:00AM, Feb.1994), noticed an aircraft (to the left 200ft/100ft up) flying at the same rate of speed. At first only could see 2 colored lights, and a spotlight beam that did not reach the ground, noticed colored lights slowly turning (first appeared as helicopter losing control). As I slowed down, the object also slowed down and began to wobble, and then suddenly flew sideways across the Freeway approx. 50ft in front of my truck, I slammed on the brakes to a stop. What me and my wife, and another vehicle behind me are now watching, was unlike anything I've ever seen, wobbling up+down (like a fresbe does at the end of a throw), now on the East side, within 100-300ft from us.
DESCRIPTION; approx 30ft diameter disc, rotating approx. 1 revolution-8sec, with a Triangle attached on the bottom (corners touching discs peremeter), but the triangle rotated twice as fast, approx 1 rev-4sec. Both disc and triangle rotated counter clockwise,then suddingly clockwise, and was dull grayish white in color, and no seams or bolts were evident. 4? colored lights were on the objects perimeter, the lights pulsed (no flash) red to yellow orange, and blue to green. There still was the bottom light beam (white), but saw no evidence of it when it flew in front of us.  The object made no sound, and its thickness was unclear, almost like it was 2 dimensional. The object appeared completely out of control, going up and down (sometimes extreamly fast), and still maintained its wobble.
After about 30-45 seconds of this, Fear overrode Couriousity, as the object, several times, got too close, and I rapidly drove off. The other car that stopped, remained parked. We watched the object continue its dance as I drove off, my wife keep telling me to pullover to watch this object, but I didn't trust it. I admit I was scared, only because of its odd flight pattern, and also because it was flying object that was too close and erratic in flight.
However I do regret not staying there to watch it, and hope too someday meet the occupants of the other car that did remain. We never reported the incident, mainly because of the reaction from those we did tell, and the fear of losing my job for accused mental unstability. Only recently we got a computer, and thats why I report it now.
ANOTHER UNKNOWN: Within days of the incident, for some unknown reason, I began writting down a series of numbers. This is what I wrote- 9 9 9 9 9 9 9 9 9 9          I've found alot of sequence and patterns within 9 8 7 6 5 4 3 2 1 9          this, including geometric shapes, mathmatical 9 7 5 3 1 8 6 4 2 9          equations, ect; but not sure what it really means? 9 6 3 9 6 3 9 6 3 9 9 5 1 6 2 7 3 8 4 9 9 4 8 3 7 2 6 1 5 9 9 3 6 9 3 6 9 3 6 9 9 2 4 6 8 1 3 5 7 9 9 1 2 3 4 5 6 7 8 9 9 9 9 9 9 9 9 9 9 9
Witness describes self as having considerable technical background.  Date is approximate.  PD