Motorists in Christchurch faced delays on Monday morning after “black ice” caused a serious crash on State Highway 1.

Emergency services responded to the crash in Russley about 6.25am. Motorists were warned this morning to expect delays and allow extra time for their journey during peak times.

A crash on State Highway 1 in Christchurch. Photo: Supplied

The crash reduced a section of SH1 to one southbound lane near the intersection with Yaldhurst Rd. 

NZ Transport Agency Waka Kotahi said the highway had been fully re-opened by 10.30am. 

"Delays through the area have eased.”

Photo: Facebook

A witness believed the crash may have been caused by a water leak that turned to “black ice”. 

“Be careful out there this winter. On Russley Road there's a water leakage on the road that turned into black ice. This is a result of this morning.”

At least one vehicle involved in the crash appears to have veered off the road and gone through a fence. 

The crash scene on SH1. Photo: NZTA