How old is this sign?

[bugo]

[agentsteel53]

the YIELD sign was introduced in 1950, with extra RIGHT OF WAY subtext, but on a trapezoidal (not triangular) base.  Most states started making these signs in the round font, but some (Vermont) made them using the old block-font dies, which has been deemed obsolete in 1948.

this sign, being of the triangular kind (as opposed to trapezoidal) is likely newer than 1954, which is the oldest I have ever seen an MUTCD supplement with a triangular sign.  It is certainly newer than the YIELD signs that do not say 'RIGHT OF WAY', which I have seen only as old as 1961.

so, I say, between 1954 and 1961, and possibly a year or two older.

(and btw, the red yield sign came into being in 1966 - I have seen it in a Penna MUTCD from that year; it was adopted as a federal standard in 1970.)

[Scott5114]

What did they do for situations that would today require a yield sign before 1950? Leave it unsigned?

[agentsteel53]

usually they put up a full stop.

[mightyace]

(and btw, the red yield sign came into being in 1966 - I have seen it in a Penna MUTCD from that year; it was adopted as a federal standard in 1970.)

Interesting, I didn't know that these originated in my home state.

That is certainly a lot better contribution to the motoring public than Clearview!

[thenetwork]

the YIELD sign was introduced in 1950, with extra RIGHT OF WAY subtext, but on a trapezoidal (not triangular) base. 

I just saw one last week that I think you are describing.  I just have to get down that way (about an hour south of my place) with camera, and get a shot of it.  Unfortunately, my travels have ceased to take me through there as of last week.  I may not get down there for another month. 

I knew it was a rather odd-looking sign for a "yield".  But then again, I was on a few of this county's backroads a couple of years ago and they were still placing BRAND NEW YELLOW Yield signs at a few of their intersections.

Will post them as soon as I can get down there.