[TCUG] Re: Part-time signals at priority junctions (not roundabou ts)
- From: "Probert, Carole" <Carole.Probert@xxxxxxxxxxxxxxx>
- To: tcug@xxxxxxxxxxxxx
- Date: Thu, 17 Jul 2008 15:29:18 +0100
I know it's not a roundabout, but CSS did a report titled a review of
signal-control roundabouts in 1997.
One result was that there was a substantial increase in accidents (66%) at
times when the signals on roundabouts were switched off. Since all other
factors remained constant at these roundabouts, the conclusion was that it
was the "part-time" effect which led to the accident problem. They quote
that this finding is consistent with growing anecdotal evidence that
part-time signals in the OFF state lead to driver confusion, possibly
because they become distracted, misled by road markings, or simply because
they misread signals which are OFF as being at green.
My view is that a junction would be more confusing than a roundabout when
the signals are OFF.
Regards
Carole Probert
Traffic Signal Design Team Leader
AmeyMouchel (Area 9)
Tel: 01905 683219
Featurenet: 7969 3219
Mobile: 0774 871 2946
-----Original Message-----
From: tcug-bounce@xxxxxxxxxxxxx [mailto:tcug-bounce@xxxxxxxxxxxxx] On Behalf
Of Giles, Shamus (Capita Symonds)
Sent: 17 July 2008 12:51 pm
To: tcug@xxxxxxxxxxxxx
Subject: [TCUG] Part-time signals at priority junctions (not roundabouts)
We=20have=20a=20number=20of=20junctions=20which=20were=20priority=20T-junc=
tions=20which=20have
been=20signalised=20due=20to=20residential=20developments.=20=20The=20ques=
tion=20has=20been
asked,=20can=20these=20junctions=20(without=20ped=20facilities)=20be=20rec=
onfigured=20to
run=20part-time?=20=20
The=20reasons=20given=20are=20a=20bit=20vague=20but=20there=20is=20a=20fee=
ling=20that=20the
signals=20cause=20unnecessary=20delay=20when=20not=20too=20busy,=20but=20i=
t=20is=20more=20to=20do
with=20a=20general=20backlash=20against=20the=20proliferation=20of=20signa=
ls=20I=20think.
Obviously,=20the=20road=20markings,=20signs,=20visibility=20etc=20would=20=
have=20to=20be
checked=20/=20added.=20=20I=20cannot=20find=20definitive=20advice=20on=20t=
he=20matter,=20but=20it
sounds=20dangerous=20/=20confusing.=20=20Anybody=20with=20experience=20of=20
=
this=20sort=20of
junction=20operation?
Shamus=20Giles=20CEng=20MICE
Principal=20Engineer
Capita=20Symonds
The=20Capita=20Building,=20Kingmoor=20Business=20Park,=20Carlisle.=20CA6=20=
4SJ
Tel:=2001228=20673119
Fax:=2001228=20673111
Web:=20www.capitasymonds.co.uk
NCE/ACE=20Major=20Consultant=20of=20the=20Year=202006
This=20email=20and=20any=20attachment=20are=20intended=20solely=20for=20th=
e=20addressee,=20are=20strictly=20confidential=20and=20may=20be=20legally=20
=
privileged.=20If=20you=20are=20not=20the=20intended=20recipient=20any=20re=
ading,=20dissemination,=20copying=20or=20any=20other=20use=20or=20reliance=
=20is=20prohibited.=20If=20you=20have=20received=20this=20email=20in=20err=
or=20please=20notify=20the=20sender=20immediately=20by=20email=20and=20the=
n=20permanently=20delete=20the=20email.=20Copyright=20reserved.
All=20communications,=20incoming=20and=20outgoing,=20may=20be=20recorded=20=
and=20are=20monitored=20for=20legitimate=20business=20purposes.=20
The=20security=20and=20reliability=20of=20email=20transmission=20cannot=20=
be=20guaranteed.=20It=20is=20the=20recipient=92s=20responsibility=20to=20s=
can=20this=20e-mail=20and=20any=20attachment=20for=20the=20presence=20of=20=
viruses.=20
The=20Capita=20Group=20plc=20and=20its=20subsidiaries=20(=93Capita=94)=20e=
xclude=20all=20liability=20for=20any=20loss=20or=20damage=20whatsoever=20a=
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Any=20views=20or=20opinions=20expressed=20in=20this=20email=20are=20those=20
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