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<br />span completely across the asphalt travel surfaces and adjacent gravel shoulders of Brighton <br />Road, without intermediate piers. The minimum clearance beneath the underside of the box <br />truss and the road surface will be 17 feet. <br />The box truss will completely enclose the gravel conveyor and water piping, across the full <br />width of the road. A solid plate floor pan will be installed throughout the full length of the <br />right-of--way crossing, with 12-inch-high solid-plate returns up both sides, to provide <br />personnel access for inspection and maintenance of the conveyor and to prevent any material <br />from falling through the floor of the truss to the road below. Expanded metal screening (3/4" <br />x 9 gauge) will be installed above the solid-plate side returns, on both inside faces of the box <br />truss, extending the protection against falling material from the conveyor to a total height of <br />five feet above the floor of the truss. The uppermost edge of the conveyor idlers and belt will <br />be 4.75 feet above the floor of the box truss, thus maintaining all equipment and conveyed <br />aggregate below the top of the protective screening. The water piping, as necessary, will be <br />installed along one edge of the floor of the box truss. <br />The inclined approach spans at either end of the primary road crossing will be lower profile <br />and more open than the box truss. These approach spans will only be required to support the <br />conveyor system and an access catwalk for operations and maintenance personnel. As these <br />approach spans will be outside the limits of the traveled roadway and shoulder areas, the need <br />to protect against possible falling materials is substantially reduced. The piping that will be <br />supported across the road by the box truss will be routed down to ground level, once outside <br />the right-of--way, and installed in a conventional pipe trench. Typical details of the proposed <br />support sttucture and conveyor for the Tanabe crossing is presented in Figure I - "Typical <br />Conveyor Crossing Details". <br />