The dish shaped object with 3 portholes visible followed us for approximately 5 miles and then vanished.

We were driving south on a local Hwy. when I looked to my east and saw a Saucer shaped UFO flying alongside my car headed south.  It was in a green cloud and pulsated like a heart beat.  My passenger and I both saw it.  There were 3 portholes in the upper portion of the craft.  It traveled along the path of my car and at a point of about 4 miles down the road, it rotated to the left side, and within an instant was gone.  Only a small portion of the cloud was all that was left.  I called a friend of mine to tell him of the siting, and he said he knew what I had seen because he saw it as well.  He was traveling south on a Highway as much as 10 miles away heading south.  The wildest thing I have ever seen...
Witness indicates that the date of the incident is approximate.  PD