Well I must say Weepej, I've seen you put some pretty lousy arguments in the past but this one really takes it to new depths! I don't think I've ever seen a more irrational, subjective and hysterical assessment of a piece of video footage. Have you considered a career writing sensationalist, (hysterical, even!) headlines for a tabloid newspaper? It reminds me of the Monty Python witch trial in Monty Python and the Holy Grail. (or ,come to think of it, ANY witch trial)!
I've had a quick look through the threads and I don't think I can add much to Steve's arguments. I think the road looks like it slopes uphill a little, so I guess that the speed estimates might (if anything) be a little on the high side. It is with a degree of wry amusmement that I hear all the cries for 20 MPH limits and then when we see a truck driven at about that speed, it's still "homicidal" /aggressive / whatever!

I'm also not even 100% sure that video clip was running in "real time" (although if it wasn't, then I don't think it would have been far off).
The angle at which the CCTV camera was positioned makes the road look much narrower than it is. Immediately after the accident, another truck comes up behind the first one and passes it with ease on the side furthest from the camera.
The doors coming open on the skip truck may needs more thorough investigation. Let's not forget that none of this would have happened if the doors hadn't come open. Boris' "coat hanger" statement might have been correct, OR it might have been a non-technical layman's mis-interpretation of the situation. It could well be that there was some "coat hanger-like" bit of metal but it's function may not have been to retain the doors closed. For example, it might have been to retain the bolt that WAS actually supposed to keep the doors closed. Now clearly, whatever it was that was supposed to keep the doors closed didn't do it's job and a thorough investigation ought to be undertaken by competent, rational, dispanssionate and unprejudiced investigators.
My initial thought is that the truck didn't seem to hit the speed hump exactly square-on. That sort of truck body is extremely floppy and I think it might have twisted enough to allow the catch holding the doors shut to disengage from it's receptacle. Pure conjecture on my part - I simply don't know, but it ought to be part of the investigation. If I'm right, it might just as easily have happened at walking pace.
It would certainly be an easy part of the investigation - just get the truck to drive over the hump again at various speeds with someone watching the back. Of course, it could just as easily have been human error- not securing it correctly, but I wouldn't form a screaming lynch mob and burn the driver at the stake until I knew all the facts!