I have to imagine that plastic in roads would get shredded into microplastics and wind up all over the place. Wouldn't that depend on how the plastic is used?

I have to imagine that plastic in roads would get shredded into microplastics and wind up all over the place. Wouldn't that depend on how the plastic is used? Roads are complex engineered objects made up of many parts. Putting plastic in the top layer where it would be subject to wear might not work, but putting it into one or more of the substrate layers could still make the road more durable, recycle the plastic for a second life, and capture it so it doesn't end up in the environment.