When, exactly, did the "Speed Limit" become the "Speed Suggestion"?

Can someone please tell me when the "Speed Limit" became the "Speed Suggestion"?

There evidently is a thing in Arizona called the "Public Rule" that says something like this:
"Since you will not get a photo radar ticket until you are doing the speed limit plus 11 miles per hour, then it is perfectly fine to do 9-10 miles per hour over the speed limit". Never mind that you are breaking the law. Sounds more like "Mob Rule". Unless the public is allowed to over-ride legislative mandate whenever it suits them, and I just missed the announcement.

I had cars speeding down my residential street because the main road near me was closed and all traffic was diverted onto my street. I finally got two motorcycle policemen assigned to my street to help solve that problem. They both just sat there while they clocked a car going 32 mph in a 25 mph zone! The car went on by and the officer put the radar gun into it's holder and proceeded to continue looking bored while doing nothing about it. I guess going 125% of the posted limit in a residential neighborhood is OK?

Maybe this can explain part of it:
I just picked up a local Christian newspaper while getting my car fixed. There was an article where several pastors and Christian counselors have heard their members state that obedience is unnecessary! I am saved by grace, and no work is needed. Maybe those are the people I am seeing doing at least 75 mph in a 55 mph zone. Or maybe the lady doing 32 in my neighborhood thought it was her right to go that fast?

Please explain to me how this kind of scrambled logic is even considered in a "civilized" country like ours?

Immigration Reform for Dummies

I have finished the first part of my Immigration Reform for Dummies web page. So far this "complex" issue of immigration reform is all of 3 pages long! Of course, I have written it in simple English, not politicianese (government-speak).

You can see it at:
Immigration Reform for Dummies