Motorists are being told to following the directions of emergency services on the scene for detour routes.
Meanwhile in Hamilton, a motorcyclist died following a serious crash in Claudelands about 6.25pm.
Emergency services responded to the crash at the intersection of Enderley Ave and Peachgrove Rd.
A reporter at the scene said the rider appeared to have crashed into a white street sign. "The rider died at the scene," police said. "Drivers are asked to avoid the area if possible."
The Serious Crash Unit is examining the scene and the road is expected to be closed for some time.
Police investigating the incident are asking for members of the public who have information about the crash to step forward.
"Police investigating a fatal motorcycle crash in Hamilton this evening are appealing for the public's help," police said in a statement.
"Anyone who knows anything about the crash or recognises the motorcycle pictured is asked to urgently get in touch with Constable Matthew Burke at Hamilton Police on (07) 858 6200."