I passed in L1 after they had began to indicate, once I was satisfied they weren't going to return to the left lane.
For my trouble I was given the pleasure of audible and visual warning devices from the driver.
I didn't cut them up, I was past them by where the black 206 is in this picture
, and stayed well out of their way by keeping to the left of the slip road until it ends.
I see this every day. A freight train hogging the right hand lane, often at below optimum joining speed, leaving a completely clear road to their left.
The reaction of the other driver was the usual one of someone who drives in their own little bubble. At 50mph he/she should have been in the left hand lane leaving the other free for faster traffic (i.e. you).
P.S. the 206 crossing the hatchings... naughty!
A not unusual occurrence either.
With good visibility as shown in the OPs link I would use lane 1 every time making full use of the slip road
I have done this safely many times
It seems too many want to join the main carriageway at the start of the slip instead of the end and are therefore not using it as it was designed for
If people used all the available road correctly, the existing motorway carrying capacity would be utilised more effectively. They don't, so extra lanes are added and STILL the muppets hog the two right hand ones.