Motorists have been warned there is a risk of flooding on a section of the Northwestern Motorway (State Highway 16) because of unusually high tides in the Waitemata Harbour later this week.
There will be high tides of up to 3.4m - about 0.4 metres higher than normal - from Wednesday to Monday, the New Zealand Transport Agency (NZTA) says.
The area most likely to be affected is the causeway across the Waitemata harbour between the Patiki Road interchange and the Rosebank Road bridges.
The cycleway beside the highway could also be flooded, and the NZTA advises cyclists to avoid using it 90 minutes either side of high tide.
It was unlikely the motorway itself would be affected unless weather conditions had an impact on tides.
A traffic management plan to re-direct traffic away from the causeway would be implemented if there was flooding.
Such tides happen in Auckland every six to seven years.
- NZPA
Risk of flooding on SH16
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