The wide shoulder will help reduce driver frustration and unsafe passing manoeuvres by allowing slower vehicles to pull over to the left so other vehicles have the opportunity to pass.
Drivers should be courteous and allow vehicles that have slowed back into the flow of traffic.
"While we acknowledge there may be some frustration with the removal of the passing lane, Waka Kotahi is committed to Vision Zero, a vision for Aotearoa New Zealand where no one is killed or seriously injured on our roads, and removing the passing lane in this location is the safest option," Wilton said.
These works are part of Section 8 of the project, Sharp Rd to Sargent Drive. Temporary speed limits will be in place to allow traffic to adapt to the new road layout and the works are expected to be done by 11 June.
Other activity on the state highway included relocation of services, shoulder widening and new line markings between Athenree Rd and Kauri Point Rd.
Minor delays should be expected and drivers were encouraged to take extra care, slow down and follow directions of the traffic management staff and signage.
"Ideally we would have provided more notice about these works taking place, however delays on other areas of the project with consents has meant the construction team are moving around the corridor where they can," Wilton said.