The Kopu Bridge is a single-lane swing bridge that spans the Waihou River, near its emergence into the Firth of Thames in the Thames-Coromandel District of New Zealand's North Island. The bridge was completed in 1928 and was part of State Highway 25. The swinging span in the middle of the bridge is 43 metres long and with an overall length of 463 metres, the bridge was the longest and oldest single lane bridge within the state highway network.
As the first available crossing of the Waihou River and the main link between the Hauraki Plains and Coromandel Peninsula, it sees a lot of traffic, especially during holidays. Due to a gradual increase in the traffic between Auckland and the Coromandel Peninsula, by the early 1990s the bridge became the most heavily used single lane bridge in the country, with traffic volumes of an average of 9,000 vehicles per day. Traffic flow over the bridge was controlled by traffic lights and the bridge was notorious for queues which formed during peak times such as holiday weekends, when three hours delay were common.
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