US Patent 10112541 Low-floor drop frame for passenger transport vehicle

A vehicle for transporting passengers. The vehicle comprises a chassis including a front axle, a rear axle, and a frame that includes a front section that supports the front axle and a rear section that supports the rear axle. The vehicle further comprises a drop frame insert located between the front section of the frame and the rear section of the frame. A top surface of the drop frame insert is positioned lower than a top surface of the frame, and at least a portion of a bottom surface of the drop frame insert is generally coplanar with a bottom surface of the frame.