Lewis Pass is now open after a truck rolled early on Thursday morning.
The incident, near Goings Creek Bridge on the Lewis Pass Road, closed traffic in both directions forcing commuters to delay travel.
Police say a truck rolled on Lewis Pass Road just after 6am, closing State Highway 7.
The highway is now open under stop/go control.
Transport for Christchurch advise motorists to take extra care when driving through the area and expect delays.