Dorian Zgraggen writes:
I recently published a set of road textures, you can check them out here.
Now there are more than 320 free CC0 textures available on cgbookcase.com (the last time I posted there were only 250)!
They were all created in Substance Designer, using the "Physically Based (Metallic/Roughness)" template, so they work very well with the Principled BSDF.
If you're curious how to use them, here's a screenshot on how I recommend to set them up: