Going too fast,maybe 
llanellistar.co.uk/Lorry-car … ory.html#2
Boy racer 
fire brigade have forklifts,maybe they can push it back into position and the driver can then re strap
You should have seen the wagon and drag load of hay I saw go up the A1 last Thursday - it was letting hay loose the whole Stamford to Grantham stretch. I wonder how much of it made it to the truck’s destination.
That would be the final straw for me.
Could’ve been worse. If it had been strapped down as some as those on here think you should instead of properly how it was then it would’ve been all over the road.