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Ddey65
I hope the last one is some sort of staging area. The black and white "<>" diamond sign on the right of the first picture represents a bus or high-occupancy-vehicle travel route. This type of sign would not have existed then.
There's that, and the "No Left Turn" symbol sign, not to mention the overhead street-name signs. Have you ever seen that patrick Swayze movie "Three Wishes?" There's another sign goof in that one near a road construction site.
http://us.imdb.com/title/tt0114663/goofs
The red slash through symbol regulation signs weren't available in this country until 1971 either.