The new Christchurch Northern Corridor motorway and shared path will be open to all traffic tomorrow from 1pm.

Council officials will keep a close eye on traffic volumes in the St Albans, Edgeware and Mairehau areas.

It bypasses the residential suburbs of Belfast, Northwood and Redwood, which is expected to help ease congestion on Main North Road.

NZTA is encouraging drivers to take care in the early days as people get used to the route.

What’s the speed limit?

The permanent speed limit on the Christchurch Northern Corridor will be 100km/h between the Waimakariri River and QEII Drive.

It will reduce to 80km/h at the interchange with QEII Drive.

The speed limit on QEII Drive will remain at 80km/h.

The speed limit through the Cranford basin section will reduce from 80km/h to 50km/h.

The speed limit will not change on the Cranford Street section of the project, which is 50km/h.