cigar shaped object with colors of orange, blue and green that changed colors in a strobe from orange to blue to green over and over.

It was lightly snowing and dark there was one object, it looked sort of like a cigar but with two bumps on the top.  It was three colors: bright orange on the bumps, a bright blue middle stripe, and the bottom was green.  It would start with the bumps on the top bright orange, then the blue would be the brightest, then the green and it would keep rotation the brightness of the colors.  I was driving on I-70 between Denver and Golden, headed to Golden.  I saw it from the left side of the car at about eye level.  My car engine died and would not start until the thing disapeared.  I stayed there for about 20 minutes with the colors kind of in a strobe mode from the top to the bottom in order of brightness.  I was eighteen and headed to Golden to get my graduation pictures for the school album.  After 20 minutes it just kind of faded away.  There were no sounds.  I have only told this to one other person until now.  I will send a crude drawing, it would be impossible to really draw it.