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[Brian556]

US 70 Valliant, OK. In GSV, you can see workers rolling out plastic or some other rollable material. it is being placed between layers of the road base. Anybody know exactly what material it is or the reason for using it? I've never seen this before

https://www.google.com/maps/@34.0152291,-95.1595262,3a,15y,76.19h,85.43t/data=!3m6!1e1!3m4!1s8SKmPpfcnH0emfvLQ1cQxw!2e0!7i13312!8i6656

[Bitmapped]

It looks like it might be a geotextile to assist with stabilizing and draining the base.

[silverback1065]

Ya likely geogrid. In Indiana it's called "subgrade treatment type 2"

[Road Hog]

I’ve seen this proposed as a way to keep cracks in the base from propagating to the road surface, but I’ve never seen it myself actually used in practice.

[cpzilliacus]

I saw the contractors working for WVDOT/DOH installing some sort of black plastic after the subgrade was ready but before the rebar was placed (and obviously before concrete was poured) on ADHS Corridor H between Dominion Virginia Power's Mount Storm Generating Station in Grant County and the current western terminus of eastern Corridor H near WV-32 at Davis.

Map here.