Was driving home. Driving on 295 south from Mercerville/Hamilton. When I noticed a purple/Bluish light over where 295 crosses over 195. It first appeard as a spec of light but caught my attention because of the color of it. It was coming toward me going north on 295 as I was going south. Finally meeting it right over me at around Mercerville/Whitehorse rd. When I looked as it passed me it appeared to look like a bluish color. Like you would see on a cutting torch. I saw no marker lights and it made no sound. I would estimate it to be 500 to 1000 feet high and 7 to 15 feet across. The object went in a straight line along 295 north until it got to Mercerville/Whitehorse road and disappeared from site going towards Hamilton.