[TCUG] Re: Wacky Ideas - Isolated Ped Crossings
- From: "Wallis, Ian" <Ian.Wallis@xxxxxxxxxxxx>
- To: "'tcug@xxxxxxxxxxxxx'" <tcug@xxxxxxxxxxxxx>
- Date: Wed, 16 Jun 2004 10:36:34 +0100
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In Derby we adopt a pre-timed max mode of operation for crossings, even
those within a UTC region (with the odd exception). We find this gives the
ped priority that we are bound to provide while having little effect on UTC
operation. You do have to set your timings up with a bit more thought than
usual though.
I believe some Authorities (was one of them Nottingham?) did a study on this
and found that there was little justification for having crossings on plan
but good pedestrian benefits were obtained running them isolated. Does
anyone know where to put their hands on a report.
Incidentally, this use of pre-timed max coupled with sensible max times is
the main reason why we changed our policy and don't install kerbside
detectors as a matter of course.
Ian Wallis
Derby City Council
-----Original Message-----
From: Graham Jones [mailto:GWJones@xxxxxxxxxxxxxxx]
Sent: 16 June 2004 10:26
To: 'tcug@xxxxxxxxxxxxx'
Subject: [TCUG] Wacky Ideas - Isolated Ped Crossings
Has anyone investigated delays associated with the operation of isolated ped
crossings
Outside my old Plymouth office there is a newly installed puffin serving
relatively few peds, say 1 per minute.
Invariably, the practical operation goes something like this.
1) Confronted with a constant flow of slow moving traffic, ped presses
button
2) traffic continues to roll
3) peds get very impatient
4) ped sees gap in traffic
5) ped crosses road
6) sensors detect gap in traffic.
7) signals turn red
8) traffic stopped at empty crossing
OK this particular crossing is particularly badly programmed, but I know of
similar sites which please neither peds nor drivers. Accepting that there
are UTC issues, I wonder if stopping traffic on ped demand would not result
in a net reduction in overall delay. I have not done my sums but leaving
aside pedestrian delay, it seems a choice between delaying a few free
flowing vehicles or more slow moving ones, which soon make up the lost
ground.
Anyone done any work on this.
Graham Jones
Traffic Analyst - Somerset County Council
Tel 01823 358235
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