In reply to
Just glad you're ok Matt. Fucking hell mate, woulda shaken me up bigtime! Sounds like a shit design tho ... Anyway, git yerself back in the cab and onto the motorway pronto eh? 
I had a very scary moment the other morning ... had just seen Sinc off at Heathrow (at 7am ... ouchie!) having had only 4 hours' sleep, and wasn't looking forward to the drive (in his car) back down the M4 in torrential rain. Bear in mind I am insured only TPFT for his brand new Octavia. Anyway, between slips at one of the junctions for Reading I move over to the middle lane (it's busy) to let ppl onto the m'way, and this fucking stupid cunt is coming down the slip, straight into the nearside lane (fine) and then ... er ... straight into the middle lane 
Was forced into the outside lane to avoid him and I was just lucky there wasn't somebody already there! Shook me up proper, it did ... fucking stupid arsewipe 
I don't get it, why do drivers drive at 90mph+ when the visibility is almost nil?
Had the exact same thing last year, came down the slip road at about 60 and straight into my path in th middle lane. Had to stamp on the brakes, if not i'd have took the cunt out 