I wonder if the tarmac has 'gone off'?
We had an incident during resurfacing of our track. Many loads of tarmac were required (delivered in 8-wheelers). One arrived being towed by another (quite an achievement when both were fully laden).
When it came to tipping, the fault with the vehicle prevented that - so the 'navvies' had to set to and shovel (they used dished tined forks) the tarmac off before it set solid.
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