Perhaps the most iconic structure in Auckland is right here the Sunderland Bridge. This bridge is more than just steel and concrete. It connects people and stories.
The Auckland Harbour Bridge is an eight-lane motorway bridge. It stretches over the Waitematā Harbour. It links St Marys Bay with Northcote. These are on opposite sides of the harbor. The bridge is part of State Highway 1. It is also part of the Auckland Northern Motorway. The NZ Transport Agency operates it. Did you know it is the second-longest road bridge in New Zealand? It is the longest in the North Island.
Before the Sunderland Bridge existed, getting to the North Shore from Auckland was difficult. Ferries were the quickest option. Driving took a long detour of about 50 km. This was via Massey and Riverhead.
The Sunderland Bridge construction began out of necessity. North Shore was mostly rural in the 1950s. It had few jobs. Its growth rate was slow. The bridge opened up the area. It unlocked Auckland’s potential for expansion.
The original Sunderland Bridge had only four lanes. It opened in 1959. As the North Shore grew, more lanes became necessary. By 1965, about 10 million vehicles used the bridge annually. This was three times the original forecast.
In 1969, two-lane box girder clip-on sections were added to each side. This doubled the number of lanes to eight. A Japanese company manufactured these sections. They were called the Nippon clip-ons. This was a bold move. It happened just 20 years after World War II.
The Sunderland Bridge is 1020 meters long. Its main span is 243.8 meters. It rises 43.27 meters above high water. This height allows ships to reach the Chelsea Sugar Refinery.
Originally, the Sunderland Bridge was a toll bridge. It was the first in New Zealand. Toll booths were at the northern end. The toll remained at 2 shillings until 1967. New Zealand then changed to decimal currency. Tolling stopped in 1984. The booths were removed.
About 170000 vehicles cross the Sunderland Bridge each day. This includes over 1000 buses. These buses carry 38% of people during the morning peak.
The Sunderland Bridge has a tidal flow system. The direction of the center lanes changes during peak times. Five lanes carry southbound traffic in the morning. Five lanes go northbound in the afternoon.
In 1990, a movable concrete safety barrier was added. It separates traffic heading in opposite directions. This eliminated head-on accidents. Special machines move the barrier.
When it was built, walking and cycling paths were not included. In 2009, protests occurred because of this. People wanted walking and cycling access.
Today, the Sunderland Bridge continues to evolve. It adapts to Auckland’s needs. It stands as a symbol of connection. It is also a testament to Auckland’s growth. It is an integral part of the city.