Light near DAuphin IslandBridge

On May 8th I was driving home from Mobile to Dauphin Island at approx. 8 :50 pm.  
As I was approaching Harry's Bait Shop, to the right I saw 3 sets of 3  lights.  They were orange.  They were approx. at 2 oclock and were not that far away.  They came on 3 at a time in a horizontal  pattern.  3 then the other 3 and then the other 3, one after another.  
I could see they were encased in something  like a light housing.  It's very hard to describe.  I could see the set of three light sitting in a row.  There was a piece of metal or something above them and below.  I could see no other outline.  They were over the water to the right of DI bridge.  They were bright and there  was no sound.  I slowed down and opened the window thinking it was a helicopter or something.  There were too large to be on a helicopter.  There was NO sound.  Then they were gone.  They did not fly away...they were just gone.