What is a bridge abutment?

Answer: B — substructure supporting one terminus of the bridge

A bridge abutment serves as a vital part of a bridge's structural support system. It is specifically designed to support one end or terminus of a bridge and plays a critical role in transferring the loads from the bridge structure to the ground. This includes vertical loads from the bridge deck and horizontal forces from both live loads (such as vehicles) and environmental factors (like wind). Abutments are typically situated at the ends of the bridge and also provide a means to retain soil and support roadway approaches leading to the bridge. This function is essential for the overall stability and durability of the bridge structure. Understanding the role of abutments is crucial for highway construction inspection, as their design and construction quality directly impact the safety and effectiveness of the bridge. The other choices do not accurately describe the function or purpose of a bridge abutment, as they either limit its significance to supporting only the bridge deck, apply to temporary structures, or describe decorative elements not related to structural integrity.