Object hovered over Baton Rouge a long time then shot away

I remember it like it was yesterday.  I was a teenager and my family was traveling from Alexandria towards Baton Rouge.  It was a clear blue sky day.  Out of the clear blue sky a large pale blue spot appeared.
Out of this pale blue spot the craft appeared and darted out ahead of us and hovered over the interstate.  People were stopped all along the highway looking at it.  State troopers were pulled off the road taking pictures and talking on the radio.  The craft was a shiny silver saucer-shaped object with green, white, and yellow lights on the bottom.  The lights turned and alternated.  It hovered a long while over the western edge of Baton Rouge.
My father would not stop for anything, even for a UFO.  All of us kids watched it intently.  We headed straight towards it for a long time.  My father was irritated at the slow moving traffic.  As we got near it, it shot out straight forward in a blast of speed with no sound nor contrails.  It then hovered over the eastern side of the city.  A we made the turn heading south, we watched it out of the back window of the car.  Eventually it shot clean out of sight in a second.  I've spoken of it only in circles of trust.
My entire family remembers that day vividly.  The date is approximate; could have been '74 - '76.  It was summer and none of us kids had left home yet, therefore we all were riding together.
Witness indicates that date of incident is approximate.  PD