Construction of roads with plastic is recent development to reduce pollution due to platic. Plastic roads are seen to be more durable and better in comparison to bitumen roads.
The construction of plastic roads seems to be a viable option for disposal of waste plastic and enhance the characteristics of binder. Plastic roads made with aggregate, and bitumen augment the binding and / or bonding characteristics of the matrix; reduce the void content; improves the compressive and bending strength. However, significant research is needed to analyze its performance at higher temperatures, especially under cyclic loading. Further, problems associated with leaching shall be taken into account. Thus, more research is needed to conclude the argument of sustainability and resilience with plastic as a foreign component.
Crumb rubber is also a good alternative due to its excellent blending nature with bitumen. Research has shown that addition of crumb rubber reduces the overall mat thickness, noise, reflective cracking, and imparts greater durability under all climatic conditions.
Coming to concrete, it is an excellent paving material where the temperatures are very high. It is strong, highly durable and long-lasting. However, reduction in sand deposits over the world is a concern.
To conclude, I would say that it would not be convenient to comment on the suitability of a particular material or the pavement system over the other. Rather, preliminary investigations that involve site specific conditions, climatic parameters, frequency of loading, and magnitude of traffic shall be considered to suggest the feasibility of a pavement system for a particular region.
Plastic as a binding agent for road construction seems a viable option to dispose off the existing plastic rather dumping around waterways but since it has so many byproduct gasses mostly activated in higher temperatures can raise other health issues. A through analysis before standardizing it would help prepare for the next step. Water turnoff from roadways already has higher contents of pollutants.