[TCUG] Red lamp monitoring
- From: "Dave Hulson" <dave.hulson@xxxxxxxxxxxxxxxxxxxxx>
- To: "TCUG (E-mail)" <tcug@xxxxxxxxxxxxx>
- Date: Thu, 9 Oct 2003 15:47:54 +0100
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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