A motor vehicle comprising: - a passenger compartment ; - two longitudinal members comprising respective rear portions arranged longitudinally in the area of said passenger compartment and respective struts , which project forward relative to said passenger compartment ; - a cross member having front connection points and rear connection points ; - a powertrain , which is supported by said cross member and/or by said struts ; - connection members , which connect said front connection points to said longitudinal members , so as to keep said cross member suspended relative to said struts , and comprise respective breakable areas , which are designed so as to break when a given load threshold is exceeded; - connection devices , which connect said rear connection points to said rear portions ; said connection devices comprising respective weakened areas designed to break so as to completely uncouple said cross member from said longitudinal members when a given load threshold is exceeded; characterized in that said rear portions comprise respective connection walls having respective first holes ; said connection devices comprising: - respective plates , which are fixed relative to said connection walls and have respective second holes vertically aligned with said first holes ; - respective first connection elements , which are coupled to said plates through welds at said second holes ; - respective second connection elements , which fix said rear connection points to said first connection elements ; said weakened areas being part of said plates and/or of said welds. - a passenger compartment ; - two longitudinal members comprising respective rear portions arranged longitudinally in the area of said passenger compartment and respective struts , which project forward relative to said passenger compartment ; - a cross member having front connection points and rear connection points ; - a powertrain , which is supported by said cross member and/or by said struts ; - connection members , which connect said front connection points to said longitudinal members , so as to keep said cross member suspended relative to said struts , and comprise respective breakable areas , which are designed so as to break when a given load threshold is exceeded; - connection devices , which connect said rear connection points to said rear portions ; said connection devices comprising respective weakened areas designed to break so as to completely uncouple said cross member from said longitudinal members when a given load threshold is exceeded; characterized in that said rear portions comprise respective connection walls having respective first holes ; said connection devices comprising: - respective plates , which are fixed relative to said connection walls and have respective second holes vertically aligned with said first holes ; - respective first connection elements , which are coupled to said plates through welds at said second holes ; - respective second connection elements , which fix said rear connection points to said first connection elements ; - respective plates , which are fixed relative to said connection walls and have respective second holes vertically aligned with said first holes ; - respective first connection elements , which are coupled to said plates through welds at said second holes ; - respective second connection elements , which fix said rear connection points to said first connection elements ; said weakened areas being part of said plates and/or of said welds. <EOS>