The crash is near the intersection of Looker Road and the State Highway, just east of Belfield.
The detour route takes drivers southbound onto State Highway 79 Rangitata-Orari Bridge Highway, then back to Winchester-Geraldine Road, with the reverse detour for drivers heading north.
NZ Transport Agency Journey Manager Lee Wright thanked drivers for factoring in extra time for this journey this morning given the length of the detour route.
Ways to find out what is happening on the highway network:
Facebook NZ Transport Agency South Island
See the NZ Transport Agency's travel and traffic page here.
Call 0800 4 HIGHWAYS 0800 44 44 49