Motorcyclist dies after crash in Auckland's Onehunga

A motorcyclist has died after colliding with a car south of Auckland this morning.

The crash happened on Onehunga Harbour Rd, near the off-ramp of the Southwestern Motorway just before 7am.

The man was in a critical condition after the crash but has since died.

Sth-Wstn Mwy heavily congested northbound Massey Rd to Mangere Bridge. Avoid area or expect #LONGDELAYS ^TP pic.twitter.com/2NaC4Wy3mP
— NZTA Akld & Nthlnd (@NZTAAkl) August 22, 2016

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Extensive delays are expected as the road closures include part of the motorway off-ramp, Nielsen Street and Onehunga Mall.

Motorists are advised to avoid the area if possible.

Neilson St On & Off Ramps to/from Sth-Wstn Mwy NOW CLOSED due serious #crash. More: https://t.co/4tZO7UOllp ^TP pic.twitter.com/rbeRJFAtOm
— NZTA Akld & Nthlnd (@NZTAAkl) August 22, 2016

NZTA is advising motorists to use the Queenstown Rd off-ramp or an alternative route.

#Crash in Onehunga causing delays on Neilson St off-ramp. Queues forming along Mangere Bridge on Sth-Wstn Mwy. Use alternate exit ^TP
— NZTA Akld & Nthlnd (@NZTAAkl) August 22, 2016

Neilson St off-ramp (northbound) from Sth-Wstn Mwy is to CLOSE due to serious #crash in Onehunga. Avoid area. Use alternate exit ^TP
— NZTA Akld & Nthlnd (@NZTAAkl) August 22, 2016

A Fire Service spokesman said the Fire Service had no involvement in the emergency response.

The serious crash unit will investigate the crash.