There was one on a bridge in HUGE letters, because the bridge had these huge panels. I recreated it on a much smaller RR bridge. I thought the impact of this most impressive. As i remember (this was some 40 years ago) there had been a scandal in the area involving police. So it was timely and very impressive. It was right along the freeway so thousands of cars daily read it.
Remember this is only a recreation of the original graffiti:
There’s an infamous truck eating bridge(low headspace) in Kansas City that they’re planning a mural for, I’m sharing the concept art for this mural.