Did TNUKCSI attend the scene to concur the cause ?
I had to go M42, M6 tonight northbound although southbound looked to be flowing ok (around 6pm), coming back M5 south was Ok. Looked to be taking stuff off site with grab and tippers.
Read onanother site that it was a Post Office dd
Double post 
Watching this :
liveleak.com/view?i=c60_1515007626
Skip to about 2:00
looks like it was RM at least.
Past the burnt out carcass going up . They were cutting it up and passed it about 45mins ago to see it hanging between 2 wreckers and a load of tarmac sweepers waiting to re lay a new road