Police arrived soon after and traffic was down to one lane as the trailer and steel was moved.
The accident happened on a notorious crash hot spot on Arapaepae Rd, near popular produce store Garden of York, although in recent times there had been few incidents thanks to a new turning bay for southbound traffic.
Members of the New Zealand Army stopped to help alert traffic on State Highway 57, east of Levin.
Garden of York and neighbouring properties were immediately without power as a result of the crash, although power has now been restored.