This document discusses continuous beams and the use of influence lines in bridge design. It describes some advantages of continuous beams over simply supported beams such as reducing the number of deck joints and bearings. It then discusses three methods for analyzing shears and moments in continuous beams: 1) the Moment Distribution method, 2) the Zuraski Method, and 3) the Finite Element Method. The Moment Distribution method, developed in 1924, remains a popular standard hand calculation approach and is the topic of the lecture. Preparing influence lines for a three-span bridge is also covered.