The NZ Transport Agency's Grafton Gully cycleway, a 1.9km extension of the North-western Cycleway is due to open tomorrow.

Prime Minister John Key will open the $14 million project tomorrow morning.

Opening at the same time will be the Beach Road walkway and cycleway project. a 1.5km dedicated cycleway along Beach Road and Mahuhu Crescent (near Vector Arena).

The Westhaven Marina promenade cycle route is expected to open later this year.

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These will be linked by cycle routes on Tamaki Drive and Quay Street.

"Once these projects are complete, there will be a continuous, safe and convenient route for cyclists to access the city centre," says Councillor Mike Lee, chair of the Infrastructure Committee.

"This project sets a new standard for cycling initiatives in Auckland and promotes cycling as a safe and convenient mode of transport."

The second stage, which will start construction in January, will link Mahuhu Crescent to Britomart Place.