I doubt it.

Unless the paved roads are physically close to the Ocean it's unlikely the plastic will be washed away to ocean water. (BTW: Plastic decomposes much faster in sea water than on land - again that doesn't make it ok to dump it in sea water though )

Furthermore the plastic is "heat treated" and then mixed/layered with Bitumen. While the chemical reactions have not been explained it's likely that some form of chemical binding is happening at those temperatures i.e. Plastic is undergoing chemical conversion - at least at amalgam level.