I will try not to blow my cover by being vague, say, I was intensely involved, checking and fixing an eruv somewhere in NY for a very long time. From my experience in my own eruv, and also of other local eruvim, today I am noheg not to rely on ANYBODY’S eruv. Now, less than a garlic peel that I am, I believe the current issue is the definition of Reshus Harabim. From my little learning, I remember that the concept of 600k which is the foundation of most eruvin in flat places, and the issue of Ocean Pkwy, is a daas yachid, (Rashi). Every other shita says 16 amos. Amos are somewhat unclear, because the tefach is unclear as follows: A mishna in Eruvin says the public is oser on the roof of a homeowner where the roof pitches down to 9 tefachim adjacent to reshus harabim, because 9 tefachim is shoulder height and the public will rest loads on the roof. It would appear that the physique of the average person of the Mishna was a short person with big hands. If however we accept the psak of R’ Moshe Ztzgl, of an amah of 18 to 24 inches, the reshus harabim of most de’os would be 32 feet. If you have a size 11 shoe, pace accross any big street in your area. If you get 32 shoe lengths, it is all over for the eruv.
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