The Type I road viaduct was modeled on a real building. It is mainly made of 3mm plywood, and the walls, abutments’ faces and railings are made of cardboard from 0.5 to 1.4mm thick. Brick and stone walls on the abutments are laser engraved. Depending on your preferences, you can use a paved or asphalt surface. It can be mounted above a single or double track line (with a track gauge of 46mm, from axle to axle).