Abstract: A truck comprises a motorized body including a chassis and a cab. The cab includes opposed sidewalls, one of which includes an access opening having front and rear edge portions. The door that covers the access opening comprises upper and lower panels. The lower panel is pivotally attached to the front edge portion of the opening to rotate about a first substantially vertical axis of rotation between open and closed positions. The upper panel is hinged to the rear edge portion of the opening to rotate about a second substantially vertical axis of rotation between open and closed positions. The upper and lower panels are sized and configured such that, when each is rotated to its closed position, each spans the opening of the cab, and the upper panel is disposed above the lower panel. In such a configuration, the lower panel can be closed to protect the driver, and the upper panel can be moved to its open position to provide ventilation.