Hi there...
I was there last night at abt 7:15pm, i got the flash too... i was 3rd or 4th car in the row at the main airport signal going towards toyota signals,, the signal went Green,, yet it flashed at the cars in-front of me, at me and the cars behind me.. am sure it was technical prob or there were testing it or something.. don't worry ur not alone.. and hopefully this fine wont show-up...

Good Luck to U and all who got the flash last night (not guilty ones :P)