[TCUG] Re: Wacky Ideas - Isolated Ped Crossings
- From: Dick Andrews <RAndrews@xxxxxxxxxxxx>
- To: "'tcug@xxxxxxxxxxxxx'" <tcug@xxxxxxxxxxxxx>
- Date: Wed, 16 Jun 2004 10:43:34 +0100
I recall that Dorset used queue detectors to release the pedestrian stage
early. Whever possible we use pretimed maxes off peak in Devon as it tends
to give an instant green man at quiet crossings.
How about using kerbside detectors to put in a pedestrian demand and to use
crossing detectors to calculate when to input a demand for the second
crossing at staggered crossings?
I've seen signals used to stop speeding traffic in Portugal. The equipment
didnt seem very reliable though.
Dick
> -----Original Message-----
> From: Graham Jones [SMTP: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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