Emergency services rushed to a serious crash affecting northern lanes of the Northern Motorway.

Reported to Police at 2:05 pm, the incident has resulted in critical injuries, prompting a closure of both lanes from the Oteha Valley Road on-ramp.

Police warn traffic congestion is escalating, urging motorists to seek alternative routes to avoid lengthy delays.

Multiple police cars, ambulances, fire trucks, and a helicopter responded to the scene.

Traffic at 3:38 pm.

Latest update: NZTA is advising motorists that the Northern Motorway is currently closed between Oteha Valley Road off-ramp to Silverdale (northbound) due the crash.

Traffic at 5:30 pm.

NZTA is advising to take Dairy Flat Highway as detour route.