The Rix Modern Highway Overpass for N & HO scales is modeled after the bridges built today to span over railroad tracks. This style of bridge is typical of most new construction and is used all over the country. The Rix Modern Highway Overpass consist of 50 foot (6-7/8 inches) spans 25 scale feet ( 3-7/16 inches) wide. which interlock together so that any length bridge can be built. The piers are designed to be adjustable so that raising (up to 5-1/2 inches tall) or lowering the bridge for different heights is quick and easy.