[TCUG] Re: 'Wacky ideas'
- From: "Wallis, Ian" <Ian.Wallis@xxxxxxxxxxxx>
- To: "'tcug@xxxxxxxxxxxxx'" <tcug@xxxxxxxxxxxxx>
- Date: Fri, 11 Jun 2004 14:10:06 +0100
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And get rid of secondary signals by using eye-level indicators.
-----Original Message-----
From: Richard Berry [mailto:richardwberry@xxxxxxxxxxxxxxx]
Sent: 11 June 2004 14:08
To: tcug@xxxxxxxxxxxxx
Subject: [TCUG] Re: 'Wacky ideas'
How about cutting some of the street clutter and going to the Spanish
(Mallorcan) one primary and one gantry (same pole) per approach - and use
the same pole to carry direction signs etc
> -----Original Message-----
> From: tcug-bounce@xxxxxxxxxxxxx [mailto:tcug-bounce@xxxxxxxxxxxxx]On
> Behalf Of mervyn.hallworth@xxxxxxxxxxxx
> Sent: 10 June 2004 15:01
> To: tcug@xxxxxxxxxxxxx
> Subject: [TCUG] Re: 'Wacky ideas'
>
>
> Those of you at yesterday's Open Meeting will be aware that we have been
> asked by the CSS Transport and Environment Committee to
> effectively come up
> with a number of 'wacky ideas' which might (say) help to relieve
> congestion
> in our towns & cities or make them safer/cheaper to run etc. This is based
> on the fact that we are no longer building new roads so we need to make
> better use of those we've already got. The hundreds of ideas (?)
> we come up
> with will be sifted by TCUG Committee before passing a 'short' list on to
> the Environment Committee later in the summer.
>
> To start off this process, here is a 'not so wacky' idea (actually in use
> in one part of UK - Northern Ireland):
>
> 'Magic ambers'
> The 'early start' sequence at signalled junctions, to provide
> right turning
> vehicles with priority, has some advantages over the (more widely used)
> 'early-cut-off' sequence. 'Early starts' can reduce confusion for
> pedestrians (one direction of traffic does not suddenly stop leaving the
> other still running - as with 'early cut-offs'), and it can handle more
> right turners per cycle (since vehicles can not only turn right during the
> 'early start' stage, but also later during the intergreen following the
> 'two-way running' stage). In some cases (depending on junction spacing &
> cycle time) it can also fit in better with UTC coordination.
>
> But the 'early start' suffers from accident potential, due to uncertainty
> for right turners on the change from 'early start' stage to 'two-way
> running' stage. This safety problem has, in recent years, often been
> relieved by the use of an 'indicative right turn arrow' during the 'early
> start' stage, but despite this the technique is little used outside NW
> England. The exception to this is Northern Ireland where (as I understand
> it) they routinely add an extra AMBER signal specifically to address the
> uncertainty issue - sited above the indicative green arrow and appearing
> for 3 secs after the termination of the associated green arrow. The fact
> that Northern Ireland have written such use of an amber (ie without an
> associated red) into their own version of TSR&GD, would appear to be an
> endorsement for the use of this technique - indeed they commonly refer to
> the signal as 'Magic Amber'.
>
> Arguably the rest of the UK should have access to this facility and
> furthermore (at some risk of delaying its use the odd decade!) it could
> possibly be enhanced by the use of 'amber arrows' instead of
> 'full ambers'.
> So, for the avoidance of doubt, the 'Magic Amber' sequence I am suggesting
> could be selectively trialled (outside NI) is:
>
> RED (direction 1), RED (direction 2)
> RED (direction 1), RED/AMBER (direction 2 - using the
> 'normal' amber)
> RED (direction 1), FULL GREEN + RT ARROW (direction 2)
> RED (direction 1), FULL GREEN + RT AMBER ARROW
> (direction
> 2 - using the 'magic' amber')
> RED (direction 1), FULL GREEN (direction 2)
> RED/AMBER (direction 1), FULL GREEN (direction 2)
> FULL GREEN (direction 1), FULL GREEN (direction 2)
> AMBER (direction 1), AMBER (direction 2 - using the 'normal'
> amber)
>
> But I'm sure y'all can come up with much 'wackier' ideas than this!
>
> Mervyn
> Leeds
> 0113 2476750
>
>
> (Embedded image moved to file: pic09741.pcx)
>
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