Road procedural texture can be found here:
A demo can be found here: https://www.babylonjs-playground.com/##FBW4N#0 -
This texture has 1 parameter :
var roadmaterial = new BABYLON.StandardMaterial("road", scene);
var roadmaterialpt = new BABYLON.RoadProceduralTexture("customtext", 512, scene);
roadmaterial.diffuseTexture = roadmaterialpt;