Relief is in sight for motorists tired of congestion on the Caversham Motorway, New Zealand Transport Agency projects team leader Simon Underwood says.
Work began on the $19.5 million, stage-one upgrade in January and he was aware there had been some frustration as work to widen one section near Barnes Dr to four lanes resulted in traffic bottlenecks.
However, the area would be sealed and a new traffic layout in place during the first week of May, he said.
"We are mindful that there have been delays for motorists. There is relief in sight."
The project was going "very well" and all work was on schedule.
"Behind the scenes", 1200 prefabricated 2m by 2m concrete panels have been made by the contractor Downer.
These will be used to create three retaining walls, the foundations for which are nearly complete.
These will be backfilled to create space for a second Glen overbridge and allow for the extension of the four lanes.
The largest wall, 330m long, will run along the railway embankment between Clyde Hill and the Goodall St footbridge in Caversham, peaking at 5m.
Two others will go in around the back of footpaths on South Rd at the Glen, peaking at 8m, and Bridge St, at 6m.
"Once the Barnes Dr work is done, the focus moves to getting those walls built," Mr Underwood said.
The new two-lane overbridge will carry city-bound traffic while the existing bridge will become dedicated to outward traffic.
A webcam focused on the upgrade was expected to go live on the NZTA website by the end of the month.
It would enable people to keep an eye on progress, and assess traffic flow before travelling, he said.
A dedicated project website had also been running to keep the public informed about the project, www.nzta.govt.nz/projects/caversham-highway
