Police are advising the Port link to the Southern Motorway, at Grafton, is currently closed.

A pedestrian has been critically injured, and diversions have been put in place in the area.

The northbound lane of the Christchurch Northern Motorway, on Waimakariri Bridge, is blocked following a mud spill this afternoon.

Police were called to the spill around 3.40pm.

Hawke's Bay Expressway/State Highway 2, Napier, is currently blocked in both directions following a crash this afternoon.