Upon loading in to modded maps and vanilla, road surfaces are now sounding like grass or the surface that is under them.

Some dirt roads also sound like grass.

Some concrete ones make grass noises with the odd concrete foot step.

Load any map and try.
For example I loaded Stuart Island and all tarmac roads were grass etc..

Also tried Chiemsee same result, all make grass.

Tried Chernarus and livonia.

Any map will give you the same result.

Surface / roadway sounds to be correct for surface type.