>
>
> Guy I worked for 20 very odd years ago built these systems.  One or two
> were installed in Hawaii, a few in California, and one in the I-95 "Ft.
> McHenry" tunnel in Baltimore. Others in other tunnels.


Hah! I remember that one, in the pali tunnel!  I saw the radiax.
(aka Tandy RG-8 :)  )


A digital voice recorder had canned messages like "the tunnels on fire
> and you're all going to die!!!"  I think they removed those.  No sense
> of humor.


The pali one is pretty short, I always thought it was silly to turn the
lights on and off.
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