How many layers are required for a 4-lane Expressway in general? What are they?

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• Apr 27th, 2009

There are 4 layers.1.) Bitumen layer2.) Concrete3.) Metal bed4.) Gravel

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• Apr 25th, 2009

There are 4 layers.1. Asphalt2. Concrete3. P.C.C.4. Sand filling

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