David A Stocks wrote:
"John Rowland" wrote in
message ...
The traffic lights here have three (traffic) phases:
1) turn right from the main road
2) forward or left from the main road
3) forward, left or right from the minor road
...in that order. Every other junction which I know has these three
phases has them in the opposite order.

Does anyone know why this junction is different?


Looking at the junction on Google Maps the A10 is two lanes per
direction dual carriageway which expands at the junction to five
lanes arranged left to right as follows:

1 Left Turn
2-4 Ahead
5 Right Turn

It looks to me like physical constraints dictate that lane 5 is
rather short and traffic waiting there would tail back preventing
other traffic from reaching lanes 1-4.

Actually, the turning right lanes here are significantly longer than those
at all other Great Cambridge Road traffic lights in London, except Bullsmoor
Lane.

There is a junction on the A270 in Hove (near where I live) which is
even more constrained in that right turning traffic has to slew
across in front of the waiting 'ahead' traffic before making the
right turn.
http://maps.google.co.uk/maps?f=q&hl...oc=addr &om=1

That's horrendous.