I’ve seen shoes dangling from power lines all over the world just as here. It must mean something, yet I know not. In some countries there are dozens of shoe pairs, laces tied, then thrown and looped around a power line. Old shoes not needed and thrown just for fun? Some rite of passage? Let me know if you know of any special reason for this international ritual.
I think, in most places in North American, for sure, this means drugs are for sale in the location of the dangling shoes.