A strengthening member for an automotive vehicle comprises a twelve-cornered cross section including sides and corners creating internal angles and external angles. To facilitate a connection between the strengthening member and the automotive component, one of the strengthening member and the automotive component may transition from the twelve-cornered cross section at a first end of the strengthening member to a four-cornered cross section at a second end of the strengthening member. An automotive assembly may include a strengthening member connected to an automotive component via a separate bridge connection member.
