I always seem to get in the slowest lane so on my journey home I made some observations.
Before a turn off there is often a delay in the outside lane (1)
Just after a turn off lane 1 moves the fastest.
When there is a turn on lane 1 slows up again.
Lane 2 is clogged with people switching from lane 1 and lane 3.
Lane 3 seems to flow well until you get people switching in from lane 2 when lane 1 starts to slow up.
So I would say stick in lane 3 then move to lane 1 just after a junction and move back before a turn on. Avoid lane 2 as much as possible.
Have I cracked it? Does this bear out for you?
Before a turn off there is often a delay in the outside lane (1)
Just after a turn off lane 1 moves the fastest.
When there is a turn on lane 1 slows up again.
Lane 2 is clogged with people switching from lane 1 and lane 3.
Lane 3 seems to flow well until you get people switching in from lane 2 when lane 1 starts to slow up.
So I would say stick in lane 3 then move to lane 1 just after a junction and move back before a turn on. Avoid lane 2 as much as possible.
Have I cracked it? Does this bear out for you?