Front assembly for heavy goods vehicles

A front assembly in a heavy vehicle (1), which front assembly interacts with a forward portion of a longitudinal frame (10) comprised in the vehicle, and in which there is comprised an underrun protection, which in turn comprises a stiff, force-absorbing beam structure (5), the beam structure (5) being provided with at least a first fastening member (18) arranged to interact with at least one second fastening member (20) arranged at the front frame part of the vehicle (1), the first and the second fastening members being arranged, during assembly, to guide the beam structure (5) to a predetermined non-adjustable position on the frame essentially across the longitudinal direction of the frame (10), the beam structure arranged to support additional components at the vehicle front, such as footsteps (6), headlight units (7) and panels (8) at predetermined non-adjustable positions, with the beam structure and the components supported by it together forming a front module (3), the predetermined position of which causes an accurate positioning of the module relative to the rest of the front of the vehicle.