Played with our car for over 5 min. deserted freeway, took off like slingshot returned and put bright light on car, only time made noise.

Lady friend asked about funny lights in distance, I joked "it's a ufo" less than half min it was on us she said "don't look now it's right behind us". I turned to see variable glowing dayglow green disc following pulled up alongside (way too close to mistake for less than genuine) and did some flying stunts for about 5 min.  Way strange, made all my hairs stand on end literally.  Reappeared and threw extra bright light on car, flying in front of us same speed, only time it made any noise.  We both waved hi heartily at it at this time, me feeling a sense of inner peace that there could or must well be life elsewhere, having somewhat Saganistic "skeptic" belief before.  Light and noise from under craft diminished in intensity then took off like slingshot again.  We stopped in first rest area, after passing airbase I believe and French man was running around jabbering about a "phenomena fantastique". Lady frind drew nice picture of it.  I think it put bright light so it could make movies maybe.  Have wondered if other sightings were reported same areas, times.  I think it was "curious of us as we were of it". Have no idea what they have about cattle.  It was about 2.5 Lincoln continintal cars long, as I remember. Since then it seems way too many people/friends have ufo stories, including DeForrest Kelley and Jerry Garcia.  It "floated" noislessly while it played with us, noise grew when bottom opened and light started to grow too.  It flew close, like a lane and a half away on mostly deserted freeway due to strange weather patterns before they cleared and the time of night, saw maybe 3 trucks whole time until made rest stop.  Please email if additional data is needed, this is no joke.