Press Release – New Zealand Transport Agency There are big changes for North Shore drivers travelling on State Highway 18 (SH18) from today, as a new eastbound off-ramp at Paul Matthews Road opened this morning. The changes are necessary as part of the Northern Corridor Improvements (NCI) project. … There are big changes for North Shore drivers travelling on State Highway 18 (SH18) from today, as a new eastbound off-ramp at Paul Matthews Road opened this morning. The changes are necessary as part of the Northern Corridor Improvements (NCI) project. Work took place overnight to change the road layout and all traffic heading east has now shifted through a new intersection at Paul Matthews Road.