The term 'bridge length' can be summarized by the crossword solution of the word 'SPAN, ' which is a four-letter word. A bridge's length is the distance between its two endpoints, typically measured in feet or meters. Bridges are built to SPAN rivers, valleys, and other obstacles, and their length is determined by the size of the obstacle they are crossing. The length of a bridge is an important factor in its design and construction, as it affects the amount of materials needed and the cost of the project.