NZ Transport Agency October 2010 Roads of national significance Fact Sheet October 2010 Maioro Street Interchange Background • The Maioro Street Interchange project connects to the recently opened SH20 Mt Roskill Extension motorway • As part of the Mt Roskill Extension, a roundabout was constructed where the Southwestern Motorway (SH20) ends at the intersection of Sandringham Road Extension • A cycleway constructed as part of Mt Roskill Extension runs alongside SH20 • Stage 1 enabling works to prepare for construction of Maioro Street Interchange have been underway since May this year • The new interchange is one of seven overall packages of work to complete the Western Ring Route Road of National Significance between Maioro Street Interchange and Westgate • Further west on the Northwestern Motorway (SH16) at Lincoln Road a $100 million project has started to rebuild the interchange and widen the motorway beneath to improve safety, traffic flow and efficiency for freight and motorists Key features • New half diamond interchange constructed to form the gateway from SH20 Mt Roskill Extension to the Waterview Connection • Removal of the existing roundabout where SH20 ends at Sandringham Road Extension • As part of the new interchange layout, Sandrigham Road Extension will be closed between Stoddard Road and SH20 • Maioro Street will be realigned and extended further north to a new signalised intersection with Stoddard Road • Installation of two new sets of traffic lights for smooth access on and off the motorway • When complete, Waterview Connection will pass beneath Maioro Street and a new bridge will take local traffic over the motorway • Maioro Street will benefit from additional landscaping and trees • A further section of SH20 cycleway will be added to take cyclists from Ernie Pinches Footbridge through to Maioro Street • A new semi-permanent stormwater treatment pond will collect and treat runoff from the motorway • Any noise will be mitigated by realigning and extending the noise walls near Christ the King School and properties in Ernie Pinches Street • Cost - $40 million • Construction start – May 2010 • Estimated completion – March 2012 • Fletcher Construction, URS and Jasmax are constructing the new interchange for the NZ Transport Agency Benefits • Eventually the interchange will be developed into a full diamond interchange with motorway ramps for both north and southbound traffic • This will create a seamless connection between the existing and future Southwestern Motorway (SH20) • Quicker and smoother trip for cyclists with the extension of the SH20 cycleway • Local connections and motorway access established for residents of New Windsor, Mt Roskill and Wesley • The design of the interchange accommodates any planned expansion of SH20 in the future from four lanes to six lanes The Southwestern Motorway (SH20) currently finishes at a roundabout with Sandringham Road Extension. Also visible is the cycleway running alongside SH20 that will be extended as part of the project.