A driving hazard shut down two lanes on the H1 westbound Saturday night.
Shortly before 9:45 p.m. Honolulu Police closed the two most left lanes at the top of the Middle Street on-ramp due to a metal object on the road.
Police say a piece of an expansion joint is jutting through the ground.
The metal rod is said to have caused one traffic accident but no injuries were reported.
According to officers rubber tire debris was strewn about the road.