race track 3d model

"Generate only the race track, nothing else. No cars, no decorations, no fences, no scenery, no background objects—just the track layout. The track must be wide enough for 5 cars, have big curves and challenging corners, include dynamic elevation changes for jumps and slopes, and feel large and adventurous like Mario Kart. Use only neutral grey colors (#A3A2A5). Output should focus solely on the track pieces, with clear, isolated parts and no extra elements.