I remember when I was a kid
my dad would climb on the roof with a box of matches
as he lit and threw a match in the air
my mother would slap her slippers together
it was probably the worse run council display in the country..
This sort of thing I find intriguing, what went wrong. To close the motorway there must have been fallout on the carriageway from the explosion, not just some loud bang, Anybody else like to postulate...