Walthers Part # 933-3196, p. 229 Walthers 2021 HO Scale Reference. The Walthers Cornerstone Arched Road Bridge is perfect for any highway from the 1920s to the present. Typical of those built all over North America, this single arch concrete bridge is designed for handling street traffic above and below. Bridges like this were often constructed in areas where existing intersections were creating bottlenecks and safety hazards. Both the deck and the lower level of the Arched Road Bridge are designed for use with any of Walthers Cornerstone Series Street Systems components, which are available to model brick, concrete or asphalt streets to fit a wide range of modeling eras. As shown the kit measures: 7-3/4 x 10-3/8 x 3-7/8" 19.7 x 26.4 x 9.8cm; Opening: 4-5/8" 11.8cm