[TCUG] Re: Signal Head Configuration with 3 ahead lanes and 1 right turn wit no splitter island
- From: mervyn.hallworth@xxxxxxxxxxxx
- To: tcug@xxxxxxxxxxxxx
- Date: Mon, 5 Jul 2004 09:15:11 +0100
We quite often signal right turns without an island - certainly with 1
ahead lane, sometimes with 2, but I don't think we would contemplate 3
ahead lanes without an island - especially where ped signals are involved.
The sequence you propose operating doesn't help either (wouldn't be too
bad if all the heads on the approach always went to amber simultaneously
(but here it will only be sometimes 'all of them' and sometimes 'some of
them'). If you really had to pursue the possibility of a mast arm it would
seem better to only have the 'ahead signal' on it - you are trying to
increase the relative conspicuity of the ahead signals - this suggests that
you don't want to be putting any more right turn signals up!
However, what you can sometimes do is create a 'zero width' triangular
island on the turn between the ahead lanes and right turn lane (pulled
forward of the stop line if necessary) onto which you can place two signal
heads. Signals heads (to TSR&GD 2002) are narrower than they used to be,
and you may be able to add to the width available by reducing the width of
the three ahead lanes slightly (narrower lanes also give shorter distance
for peds to walk - with less lost time).
Mervyn
Leeds
0113 2476750
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