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Re:America's Biggest Asphalt Plant Is Shutting by stephenr on Sunday February 05, 2017 @11:06PM (#13576404)
The northern expressway in south Australia uses something similar made from bitumen.

Basically they lay a regular layer of non-porous bitumen, with side drains etc and appropriate camber.

They then lay the porous bitumen layer over the top. It's like a griller drip tray, without the delicious pork chops.

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