yep, they are to put on the side of the road when you break down. I have an identical set in my 52. I am guessing mine are from the 60's or 70's.
You'll never need then though
Although if you had a ford, well... that would be a different story....

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-