SUMMARY: 1972, Utah-small bright cloud, I'm driving south realize cloud is moving, suddenly cloud turnsinto silver saucer and shoots across desert.

July, 1972, few miles s.of Provo, Utah.  I'm headed south,moving from Illinois to Calif,before dusk,on 2 lane highway,notice small bright cloud up off my front right fender.(1/4 mi.?)  I,m watching it for miles,realize it's moving,  suddenly it shoots off,now it's a silver saucer, up and to the west across the desert.  
Some of my family are in a truck ahead of me.  I flash my lights,no use.  I remember a camera is in the glove box.  I'm driving and snapping pictures. Way off in the horizonis a mountain range. The craft stopped and is hovering over the mountains.  It's a long way but the sun is reflecting off from it. The craft is at a 45 degree angle.  I was stunned.
When I got to L.A., I got the film developed, had 1 picture with a fuzzy  saucer in it, took it to a photo lab and had them enlarge the fuzzy saucer.  Well, they did not have digital imaging back then and I am leery of releasing the articles. 
That was 24 years ago and I still think about it as if it were yesterday.