Wofu

Hi; I'm trying to create a racing-mission and want to use road-barriers with flashing lights (Objects[signs] -> Road barrier[small]) for corners etc. However, after one hour of googling I still cannot figure out how to activate their blinking lights. Is there some built-in function for these objects that I am missing? Or do I have to fake the flashing light by manually creating a light over the Initialization-field? Please help me out; I haven't found any thread about this topic ; /