Mark Brader:
(Other meanings of flashing green exist in other places, notably
the province of British Columbia.)

Clive Feather:
Do tell.

Off-topic. See http://www.roadfan.com/mtrfaq.html#110.

ObOn-topic version: indicates that none of the next *four* signals is red,
intended to authorize speeds above 125 mph...
--
Mark Brader "It is considered a sign of great {winnitude}
Toronto when your Obs are more interesting than other
people's whole postings." --Eric Raymond

My text in this article is in the public domain.