[TCUG] Re: Red lamp monitoring
- From: "Grahame Bath" <grahame.bath@xxxxxxxxxxxxxxx>
- To: tcug@xxxxxxxxxxxxx
- Date: Fri, 10 Oct 2003 09:04:47 +0100
Dave
I do not think it to be a useful safety feature - I regard it as a very
important (essential?) feature.
Yes there could be confusion but I would rather that than have visually
impaired pedestrians
stepping off into the path of moving traffic having been given advice that
traffic has been halted.
We do not inhibit vehicle phases 'cos hopefully the drivers have adequate
eyesight
to take the problems into account. (although sometimes I wonder if some of
them can see at all)
Regards
Grahame
~~~~~~~~~~~~~~~~~~~~~~~~
Grahame Bath
Senior Engineer, Traffic Systems
Traffic and Road Safety Group
Surrey County Council
020 8541 7346 (Tel)
020 8541 7366 (Fax)
~~~~~~~~~~~~~~~~~~~~~~~~
"Dave Hulson"
<dave.hulson@nottinghamc To: "TCUG (E-mail)"
<tcug@xxxxxxxxxxxxx>
ity.gov.uk> cc:
Sent by: Subject: [TCUG] Red lamp
monitoring
tcug-bounce@xxxxxxxxxxxx
g
09/10/2003 15:47
Please respond to tcug
I have just been reading a recent contribution regarding BV165 which refers
to red lamp monitoring and states that it is a "good safety feature". This
got me wondering how many people do feel that red lamp monitoring really is
a good think and how many people have reservations about it.
I have seen the confusion caused to pedestrians when two red lamps were out
and a pedestrian phase was inhibited (the pedestrians continued to cross
but
no longer had any indication of the safest time to cross). I have also
seen
the effects that an increased intergreen can have at a junction where there
had been a single red lamp failure (traffic that was used to following
another stream was held for an additional 5 seconds which led to them
moving
off on red and pedestrians trying to cross when they saw no-one moving).
As
a consequence I am no longer sure that red lamp monitoring is as useful a
safety feature as we are led to believe.
I would be interested to hear the views of others on this matter.
Finally, if two red lamp failures require us to disable conflicting
pedestrian phases, why do we treat conflicting traffic phases as though
nothing had happened?
Dave Hulson
Traffic Signal Design
Nottingham City Council
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