Re: Glorious, glorious summer.
The tar was originally poured whilst in a molten state in between the stones as the cobbles were set and as the tar cooled, dust gathered on top of the tar then the tar and was not seen until hot days when it bubbled to the top again. I know this because a mate of my Dad's used to work on Accy highways department and he showed me how they did when I was a kid in the 60s.
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