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In article ,
says...

Paul Mc Cann wrote:

Haven't seen them building concrete roads in years. They were usually an
un-mitigated disaster.

All new motorways have a concrete base! Topped with a bituminous layer
which is replaceable when it wears.

Regards
Capitol

Is this true ?

They actually pour and let set a complete concrete road and then
tarmacadam over it ?

Are you perhaps referring to some type of foundation ?

--
Paul Mc Cann