Bridge construction, steel construction: Superintendent at upper right listens to radio with right ear while directing the dozer operators pushing the bridge with signals of his left hand. Ironworkers standing on top of each temporary bridge pier watch process and signal superintendent with hand signals/ radio if there is reason to stop. They also unlock and lock rollers to allow movement when dozers push and to prevent movement thereafter.Superintendent is standing on stack of temporary bridge deck panels, which will span transverse bridge joists to provide final driving surface. Tyngsborough, MA 2005.

Bridge construction, steel construction: Superintendent at upper right listens to radio with right ear while directing the dozer operators pushing the bridge with signals of his left hand. Ironworkers standing on top of each temporary bridge pier watch process and signal superintendent with hand signals/ radio if there is reason to stop. They also unlock and lock rollers to allow movement when dozers push and to prevent movement thereafter.Superintendent is standing on stack of temporary bridge deck panels, which will span transverse bridge joists to provide final driving surface. Tyngsborough, MA 2005.