A speed limit sighn says 25 mph as you climb a remote road on the way to your favorite river. The reason for the sighn is just like the reason some of us want sighns on the river. Do you think most of us go 25 in the middle of nowhere? Same principle for the trash bum, he goes out to his fishing grounds and sees a sighn, but who is going to enforce anything out on the river, so trash bum dumps his sh** and goes about his way just like us driving 5-10mph over the limit on the way to our river. We didnt do any harm driving over the limit, and trash bum didnt think he did any harm dumping his empty beer containers.

people with good commom sense dont need sighns, and people with no common sense dont need sighns either because there not going to read it.

Bottom line is - do the right thing
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"I have a fair idea of what to expect from the river, and usually, because I fish it that way, the river gives me approximately what I expect of it. But sooner or later something always comes up to change the set of my ways..."
- Roderick Haig-Brown