Bridges with abutments are the distance between the ends of side walls or splayed walls of abutments on both banks; The bridge without abutment is the length of the carriageway of the deck system, which is called the total length of the bridge. Total length of bridge multi-hole span: beam-type and plate-type bridges and culverts are the sum of multi-hole standard spans; The arch bridge is the horizontal distance between the arch lines in the abutment on both sides of the river; Other forms of bridges are the length of the lanes of the deck system.