Review and Comments by the Independent Engineer cases 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 comments are received by the Concessionaire, accordance with the it shall duly consider such comments Concession Agreement and Good Industry Practice in 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 the in 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 Cattle vi) 3 A m vii) Underpass (CUP). pedestrian/cattle underpass through which can also pass Flyover is is called Light Vehicular synonymous to VUP/VOP light vehicles of height up to Underpass (LVUP).