> the signage requirements for school speed zones only require signs to designate when the school zone is in effect. So even if a school speed zone sign states that drivers must slow down “when [the light is] flashing,” that light doesn’t have to actually be flashing for a driver to get cited.

I'm a little confused. If the light isn't flashing, doesn't that mean that the school zone isn't in effect? I don't understand what about the law makes it possible to get cited when the light isn't flashing.