Review and Comments by the Independent Engineer where the Concessionaire is required to send any drawings or documents to the Independent Engineer for review and comments, and in the event such In cases comments are received by the Concessionaire, it shall duly consider such comments in accordance with the Concession Agreement and Good Industry Practice for taking appropriate action thereon. The correspondence between the Concessionaire and the Independent Engineer shall be deemed valid only if a copy thereof is endorsed to and received by the Authority. 1.18 Definitions and Interpretation 1.18.1 Unless specified otherwise in this Manual, the definitions contained in the Concession Agreement shall apply. 1 .1 8.2 Grade separated structures i) The structures through which the traffic flows at different levels are called grade separated structures. ii) A grade separated structure which is provided for crossing of vehicles under the Project Expressway is called as Vehicular Underpass (VUP). iii) A grade separated structure which is provided for crossing of vehicles over the Project Expressway is called as Vehicular Overpass (VOP). iv) A structure provided below the Project Expressway for crossing of the pedestrians is called Pedestrian Underpass (PUP). v) A structure provided below the Project Expressway for crossing of the cattle is called vi) Cattle Underpass (CUP). A pedestrian/cattle underpass through which light vehicles of height up to 3 m can also pass is called Light Vehicular Underpass (LVUP). vii) Flyover is synonymous to VUP/VOP