Douglas Harrington wrote:

I was riding along on route 6 in Seekonk, MA the other day (on the
shoulder as usual) and came to a red light at a 4-way intersection.
Pulled
up behind someone and noticed a sign on the side of the road reading
"Bicycles stop on green". What is that supposed to mean? ...

Anyone have any info on them (and
their meaning) before I email MassHighway?

This isn't the first time that sign's been seen in Massachusetts. See
http://www.bikeforums.net/showthread.php?threadid=5842
They never figured it out either.

--
Paul Turner