dont worry bro it might be sum other car who got the flash or most probably sum guy fooling around with u coz ive seen it by myself sum locals flasing light on cars while crossing signals so tht thy can freak u out n have sum fun....since ure so sure about the situation then u better calm down n check tomorrow the MOI website to make sure ure good coz the faults will come up after 24 hours on the website......hope this would be enough to relax ur nerves.......cheers