A hovering ball of white light, that was able to travel quickly and turn instantaneously.

We were teenagers parking near the Kankekee River outside of  the town of Lowell.  We saw a light coming down a farmers gravel road (we were concerned because we thought it might be the police ~ we had alcohol in the car) and watched it closely. It seemed strange, one white ,bright light hovering above the road.  It was extremely dark (no moon that night) and it was unnervingly quiet.  It continued to move forward towards us (we were off the road) still 25 feet away.  It was the size of a beachball (est.) and had no sound, moving slowly (est 20 mph).  We became curious and jumped into the car and drove out to it.  As soon as we got close it moved backwards, without turning, very quickly, too quickly for any object what we were aware of.  It was not a motorcycle (no sound), it was not a car (no taillights, ability to turn 180 immediately) and it certainly wasn't any vehicle in production in 1965 or now that could have manevoured like that. The driver of the car became really worried and frightened, he immediately turn the car around and took off.  It started to follow us, he sped up 110+ mph on the straight road and it was able to keep up with us for some time before it disappeared.
Date and time are approximate.  Corn is usually standing late in the summer, so we have assumed a date of 15AU65.  Second report from same source.   PD