render a beautifully detailed illustration of a road cross section the road surface should be a sleek asphalt gray with white dashed lines indicating lanes the bridge structure should be made of concrete portrayed in subtle shades of light gray the retaining walls under the bridge should consist of neatly arranged light gray bricks the slope leading up to the bridge should be depicted with a rich earthy brown color blending naturally with a grassy green surface the atmosphere around should feel serene and clean with bright daylight illuminating the scene giving it a modern and well maintained look architecture
