A bumper assembly having a transverse bumper body and at least one wing extension that is configured for pivotal movement relative to a side end of the transverse bumper body. Each wing extension has inner and outer surfaces and is moveable from a rest position to an impact position in response to an impact force acting within a horizontal plane. In the rest position, the outer surface of each wing extension is parallel or substantially parallel to the transverse axis, and in the impact position, the outer surface of the wing extension is positioned at an acute angle relative to the transverse axis. Each wing extension is configured to return to its rest position in response to removal of the impact force.