Circular silver object with bright lights hovered over our heads at tree top level before whooshing off

I was riding with my mother on Millbury St. in Grafton.  I was ten years old. It was just starting to get dark.  The street was a country-type road at the time. 
We noticed an object in the sky and stopped our vehicle and actually got out of the car as did the people in the car in front of and behind ours.  
We all stared up at a circular disk hovering at tree top level.  It was about the size of a station wagon.  It was silver with different colored lights around the perimeter.  It hovered there not making a sound for a few minutes while we watched standing by the sides of our cars. 
It then just zoomed off at tree top level with a whooshing sound at a very fast, steady speed and disappeared quickly.  
We didn't say a word to the other people watching (which seems odd in retrospect) and got in our car and attempted to follow it.  
We actually spotted it again about a mile up the road as it once again zoomed off from a hovering stance.  
We never forgot the experience and ! have talked about it for years.
Date is approximate.  PD