I may not be fully understanding this, but isn't this process just going to make the Ocean plastic pollution a lot worse?

i.e.

Indian Monsoon Rains wear away the plastic from the road over few months, years....

The plastic particles drain and make it to the rivers.... eventually to the indian ocean...

... few years later, we now have large scale plastic particle pollution in the indian ocean thanks to this ingenious technique of mixing plastic with bitumen.