Make regular roads look like seasonal assets. This is a seasonal snow cover spline for a 6m (20ft) wide, 1-lane road. The snow will be visible where the spline is above the route's environmental snowline, and invisible below the snowline.
Based on gfisher's AASHTO roads, scaled to 6m wide. With some height adjustments, it can be fitted over other types of 1-lane road too.
LOD's contain 6 and 4 triangles plus 1 material per repeat unit. Culled at a nominal 4000m. Made in 3DS Max 2009.