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Every inch of this road drives exactly the same. The asphalt is two shades of grey and nothing more, so there is nothing on it to avoid, no line worth picking, and no reason to lift. A driving stage without a bad surface is a corridor.

Two hazards on the route

Neither of these is a wall. Both are stretches of ground:

"OilSlick": {
  "components": {
    "MeshPrimitive": {
      "primitive": "cylinder",
      "diameter": 10,
      "height": 0.04,
      "position": [2.2, 0.03, 72],
      "material": {
        "diffuseColor": [0.04, 0.04, 0.06],
        "specularColor": [0.4, 0.38, 0.3]
      }
    },
    "SurfacePatch": {
      "surface": "oil",
      "shape": "disc",
      "radius": 5,
      "targetTag": ""
    }
  }
},
"GravelSpill": {
  "components": {
    "MeshPrimitive": {
      "primitive": "box",
      "width": 8,
      "height": 0.04,
      "depth": 20,
      "position": [-4.8, 0.03, 170],
      "material": {
        "diffuseColor": [0.36, 0.31, 0.24],
        "specularColor": [0, 0, 0]
      }
    },
    "SurfacePatch": {
      "surface": "gravel",
      "shape": "box",
      "halfWidth": 4,
      "halfDepth": 10,
      "targetTag": ""
    }
  }
}

The mesh is the paint and the component is the trigger; nothing scales one to the other. A 10-across disc wants radius: 5, an 8-by-20 sheet wants halfWidth: 4 and halfDepth: 10, and if you let those drift apart the slick catches cars a metre outside its painted edge. targetTag: "" means the patch does not care who you are — any entity with a CarDrive standing on it is affected, hostiles included.

Two hazards on the route

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