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About 2000 people have gathered near Westhaven Marina this morning as they attempt to cross the Auckland Harbour Bridge to celebrate its 50th birthday.

Newstalk ZB reported the crowd was growing but said police and Transit New Zealand had closed off the Curran Street on ramp, which is where the marchers had planned to gain access to the motorway.

There were a lot of cyclists among the people gathered, as well as parents with children in pushchairs, Newstalk ZB reported.

It is illegal for people to cross the bridge on foot or by bike without prior permission.

Police said they would address the gathering shortly.

The marchers are hoping to show the Transport Agency and the Government that there is very strong support among Aucklanders for walking and cycling on the bridge.

Spokesman Bevan Woodward says the city is one of the most unfriendly in the developed world for walkers and cyclists.