hovering triangle over highway

Was driving southbound on rt 95 near the Savannah Intl airport and saw,  through the top left hand corner of the windshield 4 bright white lights move from a diagonal position into a a horizontal position approximately 200-300 ft high...seemed very odd...I slowed down to keep watching (this became dangerous on the highway) and began looking for structure under the lights like a pole, etc...wasnt sure if it was a billboard...as I moved past it, it was very clear that this was NOT a pole/streetlight/etc - it was a soft triangle (rounded corners) and was hovering...seemingly facing north...I would guess, based on the elevation, that it was approx 150'-200' wide