Edit 5:05pm: Transport for Christchurch report that the crash and associated queuing has now been cleared, and the area has 'normal evening traffic levels'. ^Simon
Are you planning to head north out of Christchurch this afternoon? Transport for Christchurch are advising motorists to expect delays and consider delaying their travel due to a crash on the northern motorway near the Chaneys on-ramp. See this post for details.