Gone2kent, I appreciate what you are saying, and indeed it was chaos. I don't know that the pcso's could have done much more. The cordon set up was enforced by police officers, and from old stansted rd up to london road. Given the apparent severity of incident, it was indeed necessary to enforce a complete closure to keep the accident scene as it was at the time of the accident to allow an effective investigation. As irritating it must have been, I don't think too much more could be done.
One thing is would criticise was the knowledge of the pcso, in being unable to direct pedestrians up Devonshire to pass the scene, rather than through the subway. Other than that it was very sad and unfortunate. Shame on the pedestrians moaning and complaining when it was clear what was happening.

Blak Rose, as has been pointed out, and as i said under the image is it NOT the person being treated. The air ambulance tech came out of the ambulance I assume to prep for whatever they planned on doing to the patient when removed from the ambulance. He is kneeling with his large back pack unfolded getting lots of equipment out, before he went back inside the ambulance.
I appreciate your concerns and sentiment, but rest assured while I like to take pictures of many things, and share them, I have a little taste and some morals too
Sorry for any shock the pic caused you, glad you know it's not a person now.

All in all this was a major incident, and a very sad one. In a very unfortunate place and time of day. There was a very large attendance of Met officers and paramedics, and given the situation it was dealt with very well.
The fact there was an event on at the crystal halls with badly parked cars, road works making Perry vale one way (which people were ignoring) made matters worse.
Setting up a temp diversion would have been very difficult.

I wish the victim well, and hope this is the end of incidents on this stretch of road for a long time.