I completed a set of 28mm roads today. They are made from roof shingles, a method I read about on the Architects of War website. They may not be perfect, but I think they will serve well enough. I tried to make enough to fit most any layout, though they are simple enough to make should I require more roads. I only used a fraction of the package of shingle material I purchased at Lowes.
Here is shot of one of the roads with a Foundry viking. The hedges are another work in progress. I've used heavy duty metal scouring pads that I found in the paint section at Walmart. The hedges aren't terrible, but they still need a little work.
I have a few other terrain bits in the works, including some rough stone walls. Hopefully, they will be completed soon.