There are no reports of injuries from the truck crash on State Highway 1 but significant delays are expected.
Video / Waka Kotahi NZTA / Supplied
State Highway 1 at the Bombay Hills, south of Auckland, is expected to stay closed in both directions overnight after a truck crashed.
The collision happened near Beaver Rd at 5.15pm and the motorway closure began at 6.30pm.
The truck crashed through a median barrier with debris left on both sides of the motorway.
Part of the concrete median barrier was completely flattened and destroyed.
Waka Kotahi warned motorists on the route to be prepared for long delays.
The detour provided by Waka Kotahi is via Beaver Rd, Jericho Rd and Mill Rd for northbound traffic.
Southbound traffic detour at Mill Rd onto Razorback Rd and Beaver Rd.
Live cameras on the motorway show long queues on SH1 near Mill Rd.
Emergency services are on site and Waka Kotahi has asked motorists to consider delaying their journey.
Police confirmed a truck hit a barrier. There are no reports of injuries but significant delays were expected.