The 11'8" bridge sign says "OVERHEIGHT MUST TURN". It's terrible, technically correct, signage, like an automotive "PC Load Letter". It's not clear it's saying

The 11'8" bridge sign says "OVERHEIGHT MUST TURN". It's terrible, technically correct, signage, like an automotive "PC Load Letter". It's not clear it's saying you specifically are overheight. At least it needs a colon after the first word. I can see why people would sail through that wondering what it means. Also it flashes up when it detects an over-tall vehicle, but that won't be clear to a vehicle that's never been there before: it probably looks like one of those speed limit signs that flashes to everyone. And yellow-on-black signage is usually not going to tell you "stomp brakes now", usually more like "road closed next week", so it doesn't filter to the front of brain when navigating an intersection. The Australian water-shower projector is much more obvious that you have to stop right now or bad things will happen to you.