Jerry, I remember those roadside checks,, for smog,,brakes,,headlight alignment ,,cracked glass,,bald tires,,etc... back in the '70s.
The Richfield station I worked at , we would also push a tapered rubber plug in the road draft tube when we installed those closed system PCV's
And a smog check consisted of a "certified" smog check station doing a visual,,and scribbling out a carbon copy form stating my car was O.K.
