[TCUG] Re: Wacky Ideas - Isolated Ped Crossings
- From: "Bruce Slattery" <bruce_slattery@xxxxxxxxxxxxxxxxxxx>
- To: <tcug@xxxxxxxxxxxxx>
- Date: Wed, 16 Jun 2004 13:55:01 +0100
I question the difference in safety terms between pretimed max and VA on =
very busy roads which almost never gap out. The safety factor is surely in =
the 'intergreen' time which can be set to be the same on pretimed max and =
VA so because of the peds who dash accross because they are fed up of =
waiting on VA sites I would have thought Pretimed max ought to be safer.
Regards=20
Bruce Slattery
Traffic Signals Manager
>>> mcrabtree@xxxxxxxxx 06/16/04 11:09am >>>
1. can I make a plea that all those using a pre-timed max add a 3-second
delay before the signals change. Otherwise peds learn that they get
instant service, walk straight out, possibly in front of a red-runner!
2. beware of using pre-timed max's on high speed roads, it could be
dodgy to say the least
3. remember that MOVA works very well at mid-block crossings (and I know
I've said it before, and I know it might be thought of as promoting MOVA
on behalf of TRL, but it is a genuine recommendation from me, because
I've seen just how effective it is. Contact me directly for more.)
Mark Crabtree
TRL Limited
-----Original Message-----
From: Wallis, Ian [mailto:Ian.Wallis@xxxxxxxxxxxx]=3D20=20
Sent: 16 June 2004 10:37
To: 'tcug@xxxxxxxxxxxxx'=20
Subject: [TCUG] Re: Wacky Ideas - Isolated Ped Crossings
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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]=3D20=20
Sent: 16 June 2004 10:26
To: 'tcug@xxxxxxxxxxxxx'=20
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=3D20
5) ped crosses road
6) sensors detect gap in traffic.
7) signals turn red
8) traffic stopped at empty crossing=3D20
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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