This thread has reminded me of my most hated slip roads / junction which are on the dual carriageway that runs through Coventry centre.
Short - check
Obstructed view due to concrete barriers - check
Traffic joining and leaving on the same short slip - check
Always sodding busy - check
Same sort of thing in Birmingham as well apart from it being a 30 limit and everyone does 50 - 60
Reminds me of a junction in Manchester City, albeit it's not strictly a motorway but the A57M, one junction to join heading west literally has a slip road with a tight bend, and merges into the carriageway the second it reaches it. Bearing in mind that there's barriers blocking your view it is literally impossible to merge properly in a car. It has to be treated as a give way as you'd never see anything if you didn't slow dramatically at the top.
Bear in mind it's a 50mph limit dual carriageway where most people actually drive 60+ when not busy and you see the issue!