Abstract: The present invention relates to a vehicle or machinery (1) having a chassis (2) provided with ground engaging members (3) mounted on at least one transverse chassis member (4) and laterally spaced apart longitudinal chassis members (5). Each of the longitudinal chassis members (5) includes a plurality of modular elements (6) fastened together end-to-end (13, 14), which modular elements (6) are substantially hollow for housing therein moving parts (8) of the vehicle or machinery. The modular elements have access openings (18) for accessing the moving parts (8) in the interior (16) of the hollow modular elements (6), and closure panels (19) provided therefor. The present invention also extends to a modular chassis member (5) and a modular chassis element (6).