There shall be sufficient safety clearance between the cabin and spreader at all working positions. Arrangement of the cabin shall allow the operator to have the best possible view in all directions during the operation. Rear view mirrors shall be provided to enhance visibility during trolley backward motion. A convex mirror of robust construction and with size not smaller than 500 mm x 600 mm shall be provided and fitted in such a manner that the operator is able to view the sea-ward side of the spreader with container at any position of the spreader.