Asphalt Road Tile

4.0 x 4.0m asphalt road module for the kit grid, 0.05 m thick slab: one module that builds every junction from a piece knob (straight, corner, t-junction, crossroads, dead end) with lane markings and a zebra crossing as toggles, both off by default.

风格：low-poly, flat-shaded vertex colors, no textures, single shared material, so any set of these merges to one draw call; shares palette and scale with its kit