[TCUG] Re: 'Close associated' signals
- From: "Bruce Slattery" <bruce_slattery@xxxxxxxxxxxxxxxxxxx>
- To: <tcug@xxxxxxxxxxxxx>, <mervyn.hallworth@xxxxxxxxxxxx>
- Date: Wed, 27 Oct 2004 10:06:37 +0100
Mervyn, this comes down to individual junction design unless you are =
considering the phase opposite a right turn indicative green arrow when =
closely associated green arrows should be used to prevent the 'dead mans =
turn' syndrome where accidents occur because of people incorrectly =
assuming the opposing phase is red because theirs is red.=20
Generally I tend to prefer closely associated secondaries especially on =
wider roads as when put in with duplicate primaries they give a very clear =
signal at the stop line that you should stop as there are 3 red signals.=20=
I also feel that they encourage pedestrians to look at the traffic to make =
sure it has stopped rather than crossing when the vehicle has a red signal =
and is 'bound' to stop.
All in all we use these as the norm and only use far sided secondaries =
where closely associated secondaries are not appropriate.=20
I was not aware of any comparative safety reasearch and would be interested=
to know whether there is a safety case for either option.
Regards=20
Bruce Slattery
Trafic Signals and ITS Manager =20
>>> mervyn.hallworth@xxxxxxxxxxxx 10/26/04 18:00 PM >>>
Grahame,
That's really the point - we do tend to get complaints where we don't use
far-side secondaries, but it seems to me that on certain junctions
('simple' junctions where the phasing is not split) there is no need for =
it
- we should provide them with the signal they require.
Mervyn
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