Gravel / Gravé / Gnarmac / Groad / ATB

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Brommers in reply to @giofox

But macadam is short for tarmacadam, which is tarmac, otherwise known as asphalt.

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Thrustvector in reply to @Brommers

Not quite; macadam is the 18th-c. invention of Mr Macadam, viz. a carefully laid roadbed of different grades of crushed stone: larger stones as a foundation layer, and smaller stones on top. This could be laid on surfaces other than bedrock, drained well, and stood up to the passage of vehicles; tarmac was a later invention, which sprayed tar on top as a binder to keep dust down. Modern asphalt lays the aggregate and tar in one.

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BareNecessities in reply to @Thrustvector

tarmac was a later invention, which sprayed tar on top as a binder to keep dust down

I look forward to when this cutting edge technology reaches Norfolk
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Brommers in reply to @Thrustvector

Well, that's me told! Every day's a school day. Precious little of any decent road surface here in the Fens, mind you.
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c.h.e. in reply to @Thrustvector

Thanks for explaining macadam.
Although I was quite happy thinking it was because of the tasty nuts.