On Wed, 22 Apr 2009 21:57:47 UTC, Dave wrote:

Dave wrote:

I'll ask this again
Can anyone explain why some LARGE road signs have those triangle, square and
circular emblems on them? Sometimes they are empty and sometimes they
are solid colour. I would imagine that they are there for the emergency
services, but I can't understand what is what.


Bottom of second page he

http://tinyurl.com/chzraf

but I'm not sure if you mean those, or the plain yellow shapes I've seen
in the past.

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