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#821568 - 3rd Sep 2013 2:05pm Seen in the old Mersey Tunnel
Excoriator Online   content
Wise One

Registered: 21st Jan 2010
Posts: 793
Loc: wirral
Strange objects rather resembling storm lanterns dangling from the roof at intervals through the tunnel have recently appeared.

Anyone have any idea what they are?

Sorry if this is off topic, but it is undeground.

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#821570 - 3rd Sep 2013 2:11pm Re: Seen in the old Mersey Tunnel [Re: Excoriator]
_Ste_ Offline


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Registered: 7th Aug 2005
Posts: 15985
Loc: New Brighton
Do they light up?
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#821574 - 3rd Sep 2013 2:33pm Re: Seen in the old Mersey Tunnel [Re: _Ste_]
Blueskier Offline
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Registered: 22nd Mar 2013
Posts: 194
Loc: Wallasey
Got a feeling its part of a new public address system.
Saw signs for this being tested.

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#821575 - 3rd Sep 2013 2:36pm Re: Seen in the old Mersey Tunnel [Re: Excoriator]
Excoriator Online   content
Wise One

Registered: 21st Jan 2010
Posts: 793
Loc: wirral
Not to my knowledge. They only vaguely resemble storm lanterns. The place where the glass might go if they were storm lanterns appears open.

Think of a square plate about 9" by 9", with a similar plate about 9" below it held apart by four bars in the corners. Below the lower plate is a cylindrical assembly.

Apologies if the dimensions are a bit off, but I was driving at the time and I think they cops might have objected to my stopping for a photo.

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#821612 - 3rd Sep 2013 6:00pm Re: Seen in the old Mersey Tunnel [Re: Excoriator]
MrHouston Offline
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Registered: 23rd Nov 2007
Posts: 249
Loc: Wirral
I thought they were something to do with monitoring the amount of fumes in the tunnel

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#821685 - 3rd Sep 2013 9:18pm Re: Seen in the old Mersey Tunnel [Re: Excoriator]
Excoriator Online   content
Wise One

Registered: 21st Jan 2010
Posts: 793
Loc: wirral
This could be a possibility, MrHouston. Just dust collectors perhaps?

I was unaware of any plans for a public address system, but they are a long distance apart for that. I didn't count but I'd reckon perhaps ten distributed through the length of the tunnel. I left via the dock exit in Liverpool and there were one or two there too.

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#821816 - 4th Sep 2013 9:38am Re: Seen in the old Mersey Tunnel [Re: Excoriator]
OxtonHill Offline
Old Hand

Registered: 2nd Jun 2009
Posts: 311
Loc: Oxton
Probably state-of-the-art Automatic Incident Detection System.

http://www.clickliverpool.com/news/local...y-tunnels-.html

If you check out pictures for "Hindhead Tunnel" you will see a very similar object.

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#821862 - 4th Sep 2013 2:01pm Re: Seen in the old Mersey Tunnel [Re: Excoriator]
Cobby Offline
Enthusiast

Registered: 28th Nov 2009
Posts: 139
Loc: Great Sutton
Yes, as OxtonHill says. They are radar scanners - like this:



Edited by Cobby (4th Sep 2013 2:06pm)

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#821922 - 4th Sep 2013 6:00pm Re: Seen in the old Mersey Tunnel [Re: Excoriator]
Excoriator Online   content
Wise One

Registered: 21st Jan 2010
Posts: 793
Loc: wirral
Yes. That's the animal all right. In the tunnel the two plates are further apart, and it is upside down, but its clearly the same device otherwise.

Problem solved. Thanks.

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#840190 - 28th Nov 2013 7:22pm Re: Seen in the old Mersey Tunnel [Re: Excoriator]
Pete_Robbo Offline

Keep It Real !!
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Registered: 11th Aug 2008
Posts: 6640
Loc: Wirral
Speed catches chaps
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#840204 - 28th Nov 2013 8:01pm Re: Seen in the old Mersey Tunnel [Re: Excoriator]
Pinzgauer
Unregistered


Mmmm.... I see there is a metal priming tray holder underneath the unit. The unit appears to be made of some sort of plastic/polypropylene - which could melt or catch fire if a shallow tray of flaming hydrocarbons are placed below.

Merely an observation of course..........

DON'T TRY THIS AT HOME KIDDIES !!

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#840301 - 29th Nov 2013 12:31pm Re: Seen in the old Mersey Tunnel [Re: Excoriator]
Excoriator Online   content
Wise One

Registered: 21st Jan 2010
Posts: 793
Loc: wirral
I doubt if they'd be any good as speed traps. You have to identify the speeding vehicle as well as detect it is going too fast.

I think they are intended only to sound the alarm if traffic stops.

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