curved road 3d model

Create a game-ready 3D environment based on the reference image: a modern divided highway running through flat countryside farmland. The scene includes two carriageways (multi-lane each direction) separated by a wide grassy median, long gentle curve into the distance, asphalt road surface, white dashed lane markings, solid shoulder lines, reflective roadside posts, and a metal guardrail on the left side. Surroundings: large green fields, low grass shoulders, minimal trees, big open sky. Add a few power line pylons and poles far on the horizon for depth. Road geometry requirements: Use modular road pieces: straight, gentle curve left/right, shoulder, median, on-ramp/off-ramp optional. Correct lane width and spacing, clean topology, optimized for realtime. Include simple collision and clean pivots for snapping modules. Landscape requirements: Large flat terrain with subtle elevation noise; grass shoulders and field ground. Use tileable PBR materials for asphalt, painted lines, gravel shoulder, grass, far