RIGID BRIDGE

Building materials of concrete, namely, culvert sections, skewed culvert sections, headwalls, wingwalls, and strip footings; non-metal skewed bridge sections with headwalls and wingwalls; non-metal three-sided bridge systems consisting of culvert sections, headwalls, wingwalls, and footings; non-metal small span bridge systems consisting of culvert sections, headwalls, wingwalls, and footings; non-metal modular bridge systems consisting of culvert sections, headwalls, wingwalls, and footings