[TCUG] Re: Part-time signals at priority junctions (not roundabouts)
- From: Grahame Bath <grahame.bath@xxxxxxxxxxxxxxx>
- To: tcug@xxxxxxxxxxxxx
- Date: Thu, 17 Jul 2008 15:06:09 +0100
Shamus
Way back when I first started (a couple of hundred years ago- or feels like
it anyway) we had two such
installations. Nothing but problems - and we have never considered such an
operation since, although
we have a few sites with part time signals at roundabouts.
I have to ask the question - are the signals configured and operating
correctly? If fully VA, surely
any delays will only occur during periods of heavier flow, when they would
be needed anyway?
You mention these do not have pedestrian facilities, but I bet many use the
signals to cross the road.
Switch the signals off and all would be left in the dark (sorry).
You are right about the road markings. Imagine the situation with stop
lines but no signals.
How would you determine when the signals switch on and off?
Timeswitch or queue loops?
The first would not accommodate unusual peak times and the second will
cause problems in the
event of a loop fault placing a permanent demand, such as one of our
roundabout sites at present.
My advice? - although I cannot find any definitive statement, resist such a
move.
Martin Cassini has a lot to answer for. There may be questions asked, but I
would lay odds there
would be more complaints should the permanent signals be put on part time
operation.
Regards
Grahame
..............................................................................
Grahame Bath
Senior Engineer
Network Management & Information
Surrey County Council
020 8541 7346 (Tel) 020 8541 7366 (Fax)
................................................................................
"Giles, Shamus
(Capita Symonds)"
<shamus.giles@cap To
ita.co.uk> <tcug@xxxxxxxxxxxxx>
Sent by: cc
tcug-bounce@freel
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[TCUG] Part-time signals at
priority junctions (not
17/07/08 12:51 roundabouts)
Please respond to
tcug@xxxxxxxxxxxx
g
We have a number of junctions which were priority T-junctions which have
been signalised due to residential developments.The question has been
asked,can these junctionswithout ped facilities)be reconfigured to run
part-time
The reasons given are a bitvague but there is a feeling that the signals
cause unnecessary delay when not too busy,butis more to do with a general
backlash against the proliferation of signals I think.
Obviously,the road markings,signs,visibility etc would have to be
checked/added. I cannot find definitive advice on the matter,but it sounds
dangerous/confusing.Anybody with experience of this sort of junction
operation?
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