structure. A lateral span is the structure between two support pillars. However, the collapsed lateral span was cast in multiple parts, as noted in the following paragraph: “5.3.3 M/s SYSTRA have expressed vide their submission dated 17th April, 2010 (Annexure H-11, page 3) that they have envisaged “one go” (i.e. monolithic construction) for each lateral span during the development of the design. However, during actual construction the lateral span P3-P4 was cast in seven parts. The lower part of the box girder (U-shaped section comprising bottom slab and webs upto about mid height) was concreted in four different stages with three vertical construction joints. The upper part of the box girder (comprising deck slab and top half of the 16webs) was later concreted in three stages (with two vertical construction joints). It has been informed by M/s Hyundai-Gammon JV vide their letter HN-1656 dated 1st September, 2009 (Annexure L-18, page 3) that M/s SYSTRA, the designer of the main