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Police advised people not to travel on Hoon Hay Rd, between Cashmere Rd and Rose St, while emergency services responded to a collision on Friday morning.
The section of Hoon Hay Rd has been closed and officers are standing guard at each end.
A Waka Kotahi NZ Transport Agency spokesperson advised motorists to take extra care if intending to use this route.
"The police have advised of a crash on Hoon Hay Rd, between Cashmere Rd & Rose St, we have no further information about this crash at this time."
Earlier this morning, a crash involving a motorcycle and car caused heavy congestion on the Christchurch Northern Motorway (State Highway 1), near the Kainga/Chaneys off-ramp.
Emergency services were called to the crash just after 6am on Friday.
A Waka Kotahi NZTA spokesperson said it partially blocked the southbound lanes but was cleared just before 7am.