A breakdown in Auckland's new Waterview Tunnel was already causing problems for drivers hours after the route opened to traffic for the first time.
After five years of construction and $1.4 billion the long-awaited tunnel was finally opened around 12.47am today.
The first few cars had a clear run and a police escort but as the day progressed the motorway became increasingly clogged, with thousands of sightseers keen to check out the latest addition to Auckland's motorways.
The underground structure completes the key link in the 48km western motorway ring route, and is intended to ease pressure on State Highway One and the Harbour Bridge.
The tunnel was Auckland's premier tourism destination today, with cars moving at a crawl in both directions and long queues at the offramps and onramps near the tunnel.
Dozens of cars were also seen emerging from the tunnel, turning around on the Maioro St bridge and heading straight back in.
But tomorrow will be the real test for the twin tunnels as commuters use them en masse to get to work.