[TCUG] Re: New Primary Signal legal ruling
- From: "Welsh, Paul" <Paul.Welsh@xxxxxxxxxx>
- To: <tcug@xxxxxxxxxxxxx>
- Date: Wed, 10 Sep 2008 07:30:49 +0100
It's also a good idea to wire up so at least one optic on each phase is
on a separate cable back to the controller from the rest - same
principal trying to create the conditions where at least one lamp is on
in fault conditions.
PW
-----Original Message-----
From: tcug-bounce@xxxxxxxxxxxxx [mailto:tcug-bounce@xxxxxxxxxxxxx] On
Behalf Of Andrew Rawlinson
Sent: 09 September 2008 08:27
To: tcug@xxxxxxxxxxxxx
Subject: [TCUG] Re: New Primary Signal legal ruling
In Kirklees, and I other West Yorkshire Authorities we have been
following Mervyn Hallworth's 3rd unwritten rule about signal design
which is N = L+1
N = number of signal head heads and L = number of lanes. So for a 1 lane
approach this means a minimum of two signal heads.
I prefer to have at least three heads for red lamp monitoring purposes.
If two reds are out the signals look like they are off on that
particular approach. With three heads there is still the comfort that
one lamp may still be showing a red, your Honour.
Andrew Rawlinson
Kirklees Highways
Senior Engineer
Environment and Transportation
Flint Street
Huddersfield
HD1 6LG
01484 225436
>>> <R.J.Perry@xxxxxxxxxxxxxxx> 08/09/08 17:24 >>>
Hi All,
Does anyone know about a legal ruling requiring designers to provide as
a
minimum, a primary signal head for each lane on an approach either as a
nearside or offside head?
I believe the history of this is based around a court case regarding a
RTC
where the judge stated that the lack of a primary head for the lane the
driver was using meant that the driver could not be at fault in the RTC
as
the driver could not see the nearside primary and the secondary due to
vehicles obscuring the heads.
I would ask, what happened to caution and not proceeding unless it is
safe
to do so?
If you do have any information, can you provide details and any DfT
comment.
If we have to start designing this way then this will obviously require
extra islands on 3+ lane approaches or gantries or more of those lovely
cantilevered masts !! yuk.
Regards
Rob Perry
Rob Perry, Senior Engineer, Traffic Control and Systems
Dorset Engineering Consultancy, Dorset County Council,
Pullman Court Station Approach, Weymouth Avenue, Dorchester, Dorset, DT1
1GA
Tel 01305 225357 Fax 01305 225301
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