A crash is blocking two lanes on the Auckland Harbour Bridge.

The NZ Transport Agency has advised commuters to expect delays due to a crash blocking lane 2 and 3 on the Harbour bridge.

The crash is situated in the northbound lanes, with delays expected back to Wellington St.

Traffic is also heavy between Northcote Rd and Upper Harbour Highway.

NZTA advised to please pass the incident with care and expect delays.