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为了满足AASHIO(美国国家公路与运输公务员协会)规定的关于高速桥下干道结构的净空要求,桥梁的跨度必须在120～160英尺(36.6～48.8m)范围内。采用带有现浇组合桥面板的普通预应力工字梁,只有用柯罗拉多
In order to meet the clearance requirements of the AASHIO (National Association of Road and Transport Officials) for the structure of arterials at high-speed bridges, the span of the bridge must be in the range of 120 to 160 feet (36.6 to 48.8 m). Ordinary prestressed I-beams with a cast-in-place deck deck are used only by Colorado