Originally Posted by
rholland1951
In Arlington Center, a.k.a. Perplexity Junction, noticed for the first time a semiotic puzzle: triangles that may be arrowheads that may be directing outbound traffic into the left lane of the Minuteman that people may follow uncritically that may cause accidents; but of course, the triangles may signify something else altogether...
The triangles are Yield symbols, and sometimes referred to as "shark teeth." They're just starting to be used in Massachusetts.