In February 2011 an upgrade began including expand the number of lanes from two to four. It was originally expected to be completed in late 2013, but was finished in May 2013. During the early part of 2011 thousands of tonnes of earth were removed by truck and taken 3 km to build up 2 large earth ramps as part of the New Zealand State Highway 1 bypass at Horotiu. As the original road had been built largely in a gully, this included the removal of trees and other vegetation planted on the gully sides to block traffic noise. The existing cycle lane will be incorporated in the new roadway and a new cycle and pedestrian clip-on added on the southern side of the bridge. By Easter 2013 4 laning was complete. The cycle lane has acoustic barrier of blue and yellow plastic panels which prevent views of the river from vehicles on the south side. The north side of the bridge has been lined with crash barriers to prevent cars crashing into the river after an accident. A driver was killed in 2012 after her 4-wheel drive went out of control and plunged through the barrier into the river.