Currently, to hinder physical particles from flying through the lanes ground, PhysicsJS convex polygons are used. Aside from technical problems that could lay on PhysicsJS side, this may better be solved by using lines and rigid constrains.
Using lines proved as not being very effective. The particles were falling through. Overlapping convex polygons are working but there may be a more elegant solution...
Currently, to hinder physical particles from flying through the lanes ground, PhysicsJS convex polygons are used. Aside from technical problems that could lay on PhysicsJS side, this may better be solved by using lines and rigid constrains.