On Mon, 12 Apr 2021 10:50:19 +0100, NY wrote:

snip

It was a weird junction for traffic doing odd things. If I was turning
right into my road (coming from the left), I'd indicate a few seconds
before and pull over into the centre turning-right lane, carrying on
indicating. And I've lost count of the number of people who have nearly
rear-ended me and then swerved left to avoid me - presumably because
they thought I was going to accelerate to move into lane 2 of the dual
carriageway rather than slow down and turn right. I must have been doing
something wrong for it to happen so often. Maybe the signage is such
that people see the "start of dual carriageway n-hundred yards" signs
but not the "cross roads" sign and don't realise that a right indicator
might mean "turning right" rather than "moving right to overtake".
https://goo.gl/maps/fZFyenzoxRyY4CRs9 (I start to indicate somewhere
between the dual carriageway and cross roads signs) and then slightly
further on https://goo.gl/maps/F99Dua6AFXeVSofN6 (I pull into the centre
lane as soon as the hatching ends and start to brake).

There's an odd junction for joining the westbound A27 from the A280 just
outside Worthing.

The A27 is a two-lane dual carriageway at that point. The A280 merges into
lane one from a slip road. Nothing unusual about that so far.

The oddity is, about 100 yards further on from the end of the slip road
the A27 gets a third lane split off from lane two.

I've never been able to work out why the slip road doesn't simply become
the new lane one on the left.