Traffic from Edmonton reaching the Crooked Billet Roundabout is greeted by
two adjacent sets of lights on a single pole.
http://maps.google.co.uk/maps?f=d&so...8. 67,,2,2.91
Both sets work in sync, both face the same way and none of the lights is a
filter arrow.

Traffic from Gants Hill gets the same thing on the other side of the
roundabout, although there seems to be a noticeable angle between this
pair...
http://maps.google.co.uk/maps?f=d&so...96. 06,,0,6.8

What's that about? I've never noticed it anywhere else.