Can recycled plastics be used to construct side walks and fences?

Flooring made from recycled plastic

There are many fencing products being made from recycled plastics.

There is also many flooring products made from recycled plastics.

,I donu2019t know about its suitability for sidewalks.

One factor is that most plastics have rather large dimensional change with temperature.

That could result in undesirable buckling.

Plastics also are low density, so plastic sidewalks could float away in heavy rains.

Of course special, construction techniques could compensate.